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1 Geometry Semester 1 Exam Study Guide Name Date Block Preparing for the Semester Exam Use notes, homework, checkpoints, quizzes, and tests to prepare. If you lost any of the notes, reprint them from my web page (under Class Summary). Use the flashcards located at to help review terms, definitions, and concepts. DON T LIMIT STUDYING TO PRACTICE PROBLEMS IN THIS STUDY GUIDE. Know: Logic o terms: inductive reasoning, deductive reasoning, conjecture, counterexample, conditional statement, hypothesis, conclusion, negation, converse, inverse, contrapositive, Law of Detachment, Law of Syllogism o Be able to form converse/inverse/contrapositive statements from a given statement o Be able to determine if statements are equivalent (have same truth value) o Review using Venn (Euler) Diagrams to deductively draw conclusions Basics o terms: point, line, plane, collinear, coplanar, axioms, postulates, theorems, midpoint, bisector, angles (obtuse, acute, right, complementary, supplementary, vertical, linear pair) o Be able to apply midpoint and distance formulas: x x Midpoint M of points (x1, y1) and (x, y) = 1 y 1 y M, Given points A(x1, y1) and B(x, y) are points on the coordinate plane, then the distance between A and B is: AB = (x (y y ) x 1 ) 1 o Be able to classify angles as acute, obtuse, or right, and find angle measures for complementary, supplementary, and vertical angles. Parallel Lines o Given a transversal crossing two lines, be able to identify angles that are interior, exterior, alternate, consecutive, corresponding, alternate interior, alternate exterior, and consecutive interior. Know which angles are congruent or supplementary if the transversal crosses two parallel lines. o Slope: be able to find the slope given a linear equation in two variables Be able to write equations of lines given two points, or a point and a slope point-slope formula: y y1 = m(x x1) parallel lines have the same slope but different y-intercepts perpendicular lines have slopes whose product is -1 (negative reciprocals of each other) Given a line, be able to write the equation of another line that is either parallel or perpendicular to the given line through a point on the new line o Know how to apply parallel/perpendicular line theorems Triangles o Congruent triangles : Triangles may be proven congruent if all corresponding parts (angles and sides) are congruent; or the following postulates/theorems may be used: SSS, SAS, ASA, AAS, HL

2 Geometry Semester 1 Exam Study Guide Page Triangles may NOT be proven congruent if all we know is AAA or SSA Corresponding parts of congruent triangles are congruent (CPCTC) Be able to identify whether triangles are congruent or whether corresponding parts are congruent (find triangle congruence first) Be able to supply statements or reasons given a triangle congruence proof Be able to apply theorems/postulates associated with isosceles triangles (such as the base angles theorem) o Triangle Inequalities: Be able to order the sides or angles of triangle by size Be able to determine if three side lengths can form a triangle Given two side lengths of a triangle, give a range of possible values for the third side Be able to apply the Hinge Theorem to determine which angles or sides of a triangle are bigger or smaller than in another triangle. o Triangle Similarity: Be able to solve proportions. Be able to solve problems using extended ratios (e.g. finding triangle angle measures) Be able to find geometric means: the geometric mean of a and b is given by ab Be able to find scale factor of similar triangles, and apply to find missing sides in a similar triangles, and to find perimeters of similar triangles. Be able to prove similarity using AA, SSS, and SAS postulates/theorems. o Right Triangles Use the Pythagorean Theorem to find a missing side of a right triangle. Determine if three sides make a triangle, and, if so, is the triangle right, acute, or obtuse. Find missing sides of a triangle given a right triangle with an altitude drawn through the right angle to the other side (use geometric mean). Find missing sides of special right triangles ( or ). Be able to apply trigonometry ratios (SOH CAH TOA) and inverse trig to find missing sides or angles of triangles. Practice Questions 1) Given the statement "If it is Monday, then we have art class," write the converse, inverse and contrapositive of the statement. Assuming the initial statement is true, what are the truth values of the other statements ) What is the inverse of the statement "If 4x 8then x " a) If x then 4x 8 b) If x then 4x 8 c) If x then 4x 8 d) If 4x 8 then x

3 Geometry Semester 1 Exam Study Guide Page 3 3) Assuming these statements are true: Some athletes are fast runners. All fast runners like chocolate. Which of the following is a valid conclusion a) All fast runners are athletes. b) All athletes like chocolate. c) Some fast runners do not like chocolate. d) Some athletes like chocolate. 4) According to the Venn diagram at right, which is true There may be more than one correct answer. a) Some musicians play only brass. b) No musicians play both strings and brass. c) All musicians play strings. d) Some musicians play brass and strings. 5) Consider the following statements: p: The sum of three angles is 180 o q: The three angles can form a triangle. Which of the following is a symbolic representation of the statement: If three angles cannot form a triangle, then the sum of the angles is not 180 o. a) p q b) q p c) ~p ~q d) ~q ~p 6) Consider the following arguments. If the first two statements are true, in which argument is the third statement an invalid conclusion There may be more than one correct answer. a) If it snows, then we will not have school. If we do not have school, we will not have a test. If we did not have a test, then it snowed. b) If Mary does her homework, she will get an A. If Mary gets an A, she will not be punished. If Mary is punished, then she did her homework. c) If you pass the test, you will get a gold star. If you get a gold star, you will get a certificate. If you did not get a certificate, then you did not pass the test. d) If Bobby cleans his room, then he will get his allowance. If Bobby gets his allowance, he will buy a video game. If Bobby cleans his room, then he will buy a video game.

4 Geometry Semester 1 Exam Study Guide Page 4 7) Based strictly on the diagram at right, which is a valid conclusion There may be more than one correct answer. a) Some science fiction novels are also romance novels. b) No science fiction novel is also a mystery. c) No mysteries are also romance novels. d) No romance novels are also science fiction. 8) If p represents: the remainder of x is 0 and q represents: x is an even number, which is a symbolic representation of: If the remainder of x is not 0 then x is not even. a) p q b) q p c) ~p ~q d) ~q ~p 9) What is the midpoint of the segment joining (1, ) and (-5, -7) a) (9, 17) b) (5, -3) c) (8.5, 4.5) d) (3.5, -.5) 10) The coordinates of the midpoint of AB are (-, 1), and the coordinates of A are (, 3). What are the coordinates of B a) (0, ) b) (-1, ) c) (-3, 4) d) (-6, -1) 11) What are the coordinates of the midpoint of XY a) (-0.5, 4) b) (3.5, 4) c) (-3, 1.5) d) (0.5, -0.5) 1) Using the same diagram as the previous question, what is the length of XY to the nearest tenth a) 4.1 b) 8.1 c) 3.9 d) 9. 13) If line a is parallel to line b, what is m 1 a) 40 o b) 50 o c) 90 o d) 140 o 14) Line a is parallel to line b if (there may be more than one correct answer) a) m 1 m8 b) m 3 m6 c) m 4 m5 d) m 3 m

5 Geometry Semester 1 Exam Study Guide Page 5 15) George used a decorative fencing to enclose his deck. Using the information on the diagram and assuming the top and bottom are parallel, m x is: a) 50 o b) 80 o c) 100 o d) 130 o 16) Line l intersects lines w, x, y, and z. Which two lines are parallel a) w and x b) w and y c) x and z d) y and z 17) BA is parallel to CD if: a) m 1 m b) m 3 m4 c) m 1 m 90 d) m 1 m m3 m4 18) The measure of YZV is 40 o and the measure of XYZ is 65 o. Which of these angles must measure 40 o in order for VR to be parallel toyz a) YVZ b) ZVR c) ZYV d) VRX 19) What value of x will show that lines l and m are parallel a) 4 b) 96 c) 30 d) 6 0) Angle 1 is a complement of angle. If m 1 14x 8 and m 8x 6, what is the value of x and of m 1

6 Geometry Semester 1 Exam Study Guide Page 6 1) What is m 3 a) 65 o b) 75 o c) 85 o d) 90 o ) Two angles of a triangle measure 89 o and 3 o. Classify the triangle by its sides and angles. a) isosceles right b) scalene acute c) equilateral equiangular d) scalene obtuse 3) Which of the following equations represent a line with slope -5 and passes through point (1, -) a) 5x y = 3 b) -5x + y = 3 c) 5x + y = 3 d) 5x + y = -3 4) What is the slope of the line in the graph at right 1 a) b) c) d) ) Write an equation of the line perpendicular to the line shown in the graph at right (same as the previous question) and that passes through the point (-4, -3) on the perpendicular line. 6) In ABC, D is the midpoint of AB and E is the midpoint of BC. If AC 3x 15 and DE 6, what is the value of x 7) What is the slope of the line perpendicular to 7x 3y 10 a) 3 7 b) 7 3 c) 7 d) ) What is the slope of a line parallel to the line formed by connecting coordinates (-1, 5) and (7, -3) a) 1 b) -1 c) 1 d) 4 4 3

7 Geometry Semester 1 Exam Study Guide Page 7 9) If ACB CAD, what is the value of x and y 30) Which two points determine a line parallel to QR a),1 and, -1 b) 1, 4 and 5, c) 1, -1 and, -3 d) 1,1 and, -1 31) The line formed by points (5, 1), (-, 6) and the line formed by points (-3, 10), (,3) are a) parallel b) perpendicular c) not parallel or perpendicular d) unable to determine whether they are parallel or perpendicular 3) Given: AC BD, AD BC Which could be used to prove DCA CDB a) SSS b) SAS c) ASA d) AAS 33) Given: AE and BD bisect each other at C. Which could be used to prove ABC EDC a) SSS b) SAS c) ASA d) AAS 34) Which of the following could be the lengths of the sides of ABC a) AB = 1, BC = 15, AC = b) AB = 9, BC = 15, AC = 4 c) AB = 150, BC = 100, AC = 50 d) AB = 10, BC = 8, AC = 1 35) In ABC, m B 59 and m C 57. From shortest to longest, the sides of ABC are: a) AC, BC, AB b) AB, BC, AC c) BC, AC, AB d) AB, AC, BC

8 Geometry Semester 1 Exam Study Guide Page 8 36) On a map, cities Binghamton, Endicott, and Johnson City form a triangle. Endicott is 70 miles away from Binghamton, and Johnson City is 90 miles from Binghamton. Which is a possible distance from Endicott to Johnson City a) 5 miles b) 10 miles c) 150 miles d) 00 miles 37) Triangles ABC and DEF are similar and have measurements as shown. What is EF a) 1 b) 15 c) 9 d) 3 38) Given: AXY ABC AYX ACB Which is a true proportion There may be more than one correct answer. a) AX AB AY AC XY BC b) AX XB AY YC XY BC c) AB AX AC AY BC XY 39) The ratio of the perimeter of U to the perimeter of V is 1:. If the triangles are similar, what is the value of x + y a) 3 b) 6 c) 1 d) 18 40) ABC ~ EFG. What is the perimeter of EFG a) 1 b) 4 c) 36 d) 4 d) AX AB AC AY XY BC 41) The geometric mean of 8 and 10 is: a) 9 b) 40 c) 4 5 d) 5 4 4) In right triangle ABC shown in the diagram, altitude BD is drawn to hypotenuse AC, CD = 1, and AD = 3. What is the length of BD and AB Answer in simplest radical form.

9 Geometry Semester 1 Exam Study Guide Page 9 43) Using the figure out at right, find x, y, and z. Then find the perimeter of the figure. 44) The figure at right shows ABC, which is a right triangle with altitude AD drawn ( AD BC ). Find the values of a, e, d, and f. 45) The support legs on a bench are attached in such a way that the angle made by one with the ground is 130 o. What must the measure of the angle marked x be in order for the seat of the bench to be parallel to the ground 46) Which triangle is not congruent to the other three triangles a) b) c) d) 47) Mr. Anderson is constructing a walkway through his rectangular garden. The walkway runs diagonally as shown in the diagram. To the nearest tenth, what is the length of the walkway

10 Geometry Semester 1 Exam Study Guide Page 10 48) An image of a target is shown. To the nearest tenth, what is the value of x 49) What is the value of x Round to the nearest tenth. 50) Find to the nearest tenth of a degree. 51) Given a triangle with the following sides: 7cm, 10cm, and 11 cm. Is the triangle acute, obtuse, or right 5) In the diagram, m A x 6x, m B x 3, and m ACD 9x 7. What is m A 53) Given: AD bisects BC at E AB BC DC BC Prove: AB DC Statements Reasons 1) AD bisects BC at E 1) ) ) Def. of segment bisector 3) AB BC 3) 4) ABC is a rt angle 4) 5) DC BC 5) 6) DCE is a rt angle 6) 7) 7) All rt. angles are 8) AEB DEC 8) 9) AEB DEC 9) 10) AB DC 10)

11 Geometry Semester 1 Exam Study Guide Page 11 Answers: 1) ) d conv: If we have art class then it is Monday. (F) Inv: If it is not Monday, then we don't have art class. (F) contra: If we don't have art class, then it isn't Monday (T) 3) d 4) a, d 5) d 6) a, b 7) a, c 8) c 9) d 10) d 11) a 1) b 13) a 14) a, b, c 15) a 16) c 17) d 18) b 19) c 0) x = 4, m ) c ) b 3) c 4) a 5) y=-3x-15 6) x=9 7) d 8) b 9) x=8, y=1 30) d 31) c 3) a 33) b 34) d 35) d 36) c 37) c 38) a, c 39) c 40) d 41) c 4) BD=6, AB= ) x = 100 y = 50 3 z = ) a = 1 d = 7. e = 1.8 f = 9.6 P = ) 50 o 46) a 47) 8.3 ft 48) 13. in. 49) 1. 50) 56.3 o 51) acute 5) 135 o 53) 1) given ) BE CE 3) given 4) def. of perpendicular 5) given 6) def. of perpendicular 7) ABC DCE 8) vertical angles are 9) ASA 10) CPCTC

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