HPTR13 Properties of Triangles and our-sided igures Lesson 13.1 lassifying Triangles 1. lassify the following triangles by sides as a scalene triangle, an isosceles triangle, or an equilateral triangle. G H L P K X 2009 Marshall avendish International (Singapore) Private Limited. opying is permitted; see page ii. M N Q R Y Z S K T U Scalene Triangles quilateral Triangles Isosceles Triangles xtra Practice 5 87
2. lassify the following triangles by angles as a right triangle, an isosceles triangle, or an equilateral triangle. Use a protractor to help you classify the triangles. G H K L P S M N Q R T U V X W X Y Z Right Triangles quilateral Triangles Isosceles Triangles 2009 Marshall avendish International (Singapore) Private Limited. opying is permitted; see page ii. 88 hapter 13 Lesson 13.1
Lesson 13.2 Measures of ngles of a Triangle ind the unknown angle measures. The figures are not drawn to scale. 1. 38 a 46 m a 2. 39 115 e m e 2009 Marshall avendish International (Singapore) Private Limited. opying is permitted; see page ii. 3. 4. g 28 G 45 19 H m g m f 76 f xtra Practice 5 89
5. T t 88 30 V m t U 6. Q 35 36 R r S m r T 7. 8. X 28 53 V W 29 37 a 47 y Y m y m a 2009 Marshall avendish International (Singapore) Private Limited. opying is permitted; see page ii. 90 hapter 13 Lesson 13.2
Lesson 13.3 Right, Isosceles, and quilateral Triangles ind the unknown angle measures in each right triangle. The figures are not drawn to scale. 1. is a right triangle. ind the measure of. 58 2009 Marshall avendish International (Singapore) Private Limited. opying is permitted; see page ii. 2. PQR is a right triangle. ind the measure of PRQ. R P 37 Q xtra Practice 5 91
ind the unknown angle measures. The figures are not drawn to scale. 3. is a right triangle. ind the measure of. 36 47 4. is an isosceles triangle with, m 34, and m 44. ind the measure of. 44 34 2009 Marshall avendish International (Singapore) Private Limited. opying is permitted; see page ii. 92 hapter 13 Lesson 13.3
ind the unknown angle measures in each figure. The figures are not drawn to scale. 5. O is an isosceles triangle. O O. O is a right triangle. ind the measure of O 24 O 2009 Marshall avendish International (Singapore) Private Limited. opying is permitted; see page ii. 6. is an equilateral triangle and is an isosceles triangle. ind the measure of. xtra Practice 5 93
7. is a 6-sided fi gure. ll the triangles are equilateral triangles. ind the measure of. 8. is an equilateral triangle.. ind the measure of. 28 2009 Marshall avendish International (Singapore) Private Limited. opying is permitted; see page ii. 94 hapter 13 Lesson 13.3
Lesson 13.4 Triangle Inequalities omplete. Measure the sides of the triangle to the nearest inch. R P Q 1. PQ in. QR in. PR in. 2. PQ QR in. 2009 Marshall avendish International (Singapore) Private Limited. opying is permitted; see page ii. 3. PQ PR in. 4. PR QR in. Use your answers in xercises 1 to 4. ill in the blanks with Yes or No. 5. Is PQ QR PR? 6. Is PQ PR QR? 7. Is PR QR PQ? xtra Practice 5 95
omplete. Measure the sides of the triangle to the nearest centimeter. 8. cm cm cm 9. cm 10. cm 11. cm Use your answers in xercises 8 to 11. Write the sides of the triangle to make the inequalities true. 12. 13. 14. 2009 Marshall avendish International (Singapore) Private Limited. opying is permitted; see page ii. 96 hapter 13 Lesson 13.4
The lengths of two sides of each triangle are given. Name a possible length for the third side. The given lengths are in whole centimeters or inches. 15. Z 2 in.? X 4 in. Y In triangle XYZ, the length of ZY is greater than 2 inches. possible length of ZY, rounded to the nearest inch, is. 16. G 2009 Marshall avendish International (Singapore) Private Limited. opying is permitted; see page ii.? 5 cm 4 cm In triangle G, the length of G is greater than 4 centimeters. possible length of G, rounded to the nearest centimeter, is. xtra Practice 5 97
The lengths of two sides of each triangle are given. Name a possible length for the third side. The given lengths are in whole centimeters or whole inches. 17. U 9 cm? S 8 cm T 18. In triangle STU, the length of UT is less than 10 centimeters. possible length of UT, rounded to the nearest centimeter, is. R 2 in.? P 3 in. Q In triangle PQR, the length of RQ is greater than 3 inches. The possible length of RQ, rounded to the nearest inch, is. 2009 Marshall avendish International (Singapore) Private Limited. opying is permitted; see page ii. 98 hapter 13 Lesson 13.4
Lesson 13.5 Parallelogram, Rhombus, and Trapezoid ind the unknown angle measures. The figures are not drawn to scale. 1. G is a parallelogram and G GH. ind the measure of y. H 48 64 y G 2009 Marshall avendish International (Singapore) Private Limited. opying is permitted; see page ii. 2. PQRS is a parallelogram and RST is a right triangle. ind the measures of PSR and RST. Q 118 P S T R xtra Practice 5 99
3. and are parallelograms. ind the measure of. 108 59 4. PQRS is a rhombus and PR TR. ind the measure of PQR. P S T 116 Q R 2009 Marshall avendish International (Singapore) Private Limited. opying is permitted; see page ii. 100 hapter 13 Lesson 13.5
5. WXYZ is a rhombus and WV is a line segment. ind the measure of VYZ. X W 128 Y V Z 2009 Marshall avendish International (Singapore) Private Limited. opying is permitted; see page ii. 6. is a rhombus. is a line segment. ind the measure of x. x 108 64 xtra Practice 5 101
7. PQRS is trapezoid and SR PQ. SR PR. ind the measure of PRQ. S 67 R P 58 Q 8. is a trapezoid. and. is a line. ind the measure of. 96 130 2009 Marshall avendish International (Singapore) Private Limited. opying is permitted; see page ii. 102 hapter 13 Lesson 13.5
Put on Your Thinking ap! The figures are not drawn to scale. ind the unknown angle measures. 1. PQRS and STUV are parallelograms and PT PU. ind the measure of RSV. Q R U 118 V P T S 2009 Marshall avendish International (Singapore) Private Limited. opying is permitted; see page ii. 2. PQRS is a parallelogram and ST SP. ind the measure of a. T S 106 P R a Q xtra Practice 5 103
3. is a square and is a rhombus. ind the measure of. 54 4. G is a trapezoid and G. and are isosceles triangles. ind the measures of x and y. 32 G y x 2009 Marshall avendish International (Singapore) Private Limited. opying is permitted; see page ii. 104 hapter 13 Put on Your Thinking ap!
5. In the fi gure, PS PR RQ and the measure of STP is twice the measure of TPS. ind the measures of x and y. y T S P x R 27 Q 2009 Marshall avendish International (Singapore) Private Limited. opying is permitted; see page ii. 6. is an equilateral triangle. is an isosceles triangle, where, m 54, and m 118. ind the measures of x and y. x 118 54 y G xtra Practice 5 105
7. is a rectangle. and G. ind the measures of x and y. G y 34 x 58 8. is a right triangle, G is a line segment, and m m. m 90 and. ind the measures of x and y. 103 x y 56 G 2009 Marshall avendish International (Singapore) Private Limited. opying is permitted; see page ii. 106 hapter 13 Put on Your Thinking ap!