# Meet #4. Math League SCASD. Self-study Packet. Problem Categories for this Meet (in addition to topics of earlier meets):

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1 Math League SCASD Meet #4 Self-study Packet Problem Categories for this Meet (in addition to topics of earlier meets): 1. Mystery: Problem solving 2. : Properties of Circles 3. Number Theory: Modular Arithmetic, Series and Sequences 4. Arithmetic: Percent Applications 5. Algebra: Word Problems (linear, including direct proportions or systems)

2 Important information you need to know about GEOMETRY: Properties of Circles Area of a Circle: A=!r 2 Circumference of a Circle: C=!d or C=2!r *(Very Important!) Be sure to use the test s given value for! and not the! button on your calculator!!! Other properties: If AC is a diameter of a circle and point B is any other point on the circle, angle ABC will be a right angle. The measure of an inscribed angle is half the measure of the arc it subtends. For example, if arc AB is 70, then the measure of angle ADB is 35

3 Category 2 Meet #4 - March, 2017 Calculator Meet 1) The diameter of this semicircle is 28 centimeters. How many square centimeters are in its area? Use Round your final answer to the nearest tenth. 2) DE is the 25-inch diameter of this circle. FE = 20 inches. How many square inches are in the total area of the shaded regions? Use Round your final answer to the nearest hundredth. 3) Six congruent semi-circles surround rectangle QRST. The area of the rectangle is an integer number of square meters between 160 and 168. The width of the rectangle, QR, and the length, QT, are odd prime numbers. RS > RQ. How many meters are in the perimeter of the figure? Use Round your final answer to the nearest whole number. Note: The figure is not drawn to scale. R Q 1) 2) 3) S T

4 Solutions to Category 2 Meet #4 - March, ) 1) ) ) 85 rounded to the nearest tenth. 2) Angle DFE, inscribed in a semicircle, is a right angle, so that triangle DFE is a right triangle. Plan: a) Find the area of the triangle, b) find the area of the circle, c) subtract the area of the triangle from the area of the circle to find the total area of the shaded regions. a) Use the Pythagorean Theorem to find that DF = 15. Then the area of the triangle is (0.5)(15)(20) = 150. b) Area of the circle is to the nearest hundredth. c) = square inches. 3) The only number between 160 and 168 that is the product of two primes is 161. Its factors are 23 and 7. So, RQ = 7 and RS = 23. The radius of each semicircle is 23/6. The perimeter of the figure is meters (rounded to the nearest whole number).

5 Category 2 Meet #4 - February, 2015 Calculator meet "Whenever I hear anyone arguing for slavery, I feel a strong impulse to see it tried on him personally."... Abraham Lincoln, born February 12, ) How many inches longer is the circumference of a circle of radius = 20 inches than a circle of radius = 10 inches? Use 2) Given circle A with diameter = 42 feet. What is the perimeter, in feet, of sector ABC that includes radii AC and AB and arc BC? Angle A is a right angle. Use B C A 3) Two lines are tangent, externally, to two circles with diameters of 46 cm and 74 cm. AB = 48 cm. Points A and B are points of tangency. How many cm apart are the centers of the two circles? (Figure not to scale) 1) A B 2) 3)

6 Solutions to Category 2 Meet #4 - February, ) Find the difference between the circumferences of the two circles = 2(pi)(R) - 2(pi)(r) = 2(3.14)(20) - 2(3.14)(10) 1) 62.8 = = ) ) Arc BC = 1/4 (circumference of circle) = (0.25)(2)(3.14)(21) = ) 50 So, the perimeter of the sector = arc + 2 radii = (2)(21) = = feet. 3) The radius drawn to a tangent from the center is perpendicular to the tangent. * Let XA and YB be the two radii. * Draw XY to form a trapezoid with XA parallel to YB. * Draw a segment from X, parallel to AB, to a point C on YB. * We now have a rectangle and a right triangle. * BY - BC = = 14 = YC. * AB = XC = 48. * For right triangle XCY, use the Pythagorean Theorem to find the length of XY, the distance between the centers of the two circles: B A X C Y

7 Category 2 Meet #4, February 2013 You may use a calculator. 1. A car turns 180 degrees on an arc of a circle. The tires on the inside of the turn are 20 feet from the center of the arc and the tires on the outside of the turn are 25 feet from the center of the arc. How many feet farther do the outside tires travel than the inside tires? Use 3.14 for π and round your answer to the nearest whole number of feet. 2. In circles, the measure of an inscribed angle is equal to half the measure of the intercepted arc. If the measure of arc QS is 90 and the measure of angle RQT is 60, as shown in the figure, how many degrees are there in the measure of angle RUT? 3. The figure below was created from two concentric circles with centers at point C. Line segments AF and EI are bisected by point C, and each of the resulting segments is then bisected at points B, D, G, and H, as shown. If segment AB is 2 cm and angle BCD is 120 degrees, how many square centimeters are there in the entire figure? Use 3.14 for pi and express your answer to the nearest tenth of a square centimeter. 1. feet 2. degrees 3. sq. cm

8 Solutions to Category 2 Meet #4, February feet degrees 1. The circumference of an entire circle is the sq. cm. diameter times π, so half that amount is the radius times π. The tires on the outside of the turn travel 25π feet and the tires on the inside of the turn travel 20π feet. The difference is 25π 20π = 5π, which is about 15.7 feet, or 16 feet to the nearest foot. 2. Angle QRS intercepts arc QS, so it must be 90 2 = 45 degrees. Since triangles have an angle sum of 180 degrees, the measure of angle QUR must be 75 degrees. Finally, angle RUT is supplementary to QUR, so it must measure = 105 degrees. 3. The area of a circle is the square of the radius times π. Our picture can be thought of as 2/3 of a circle with radius 2 cm and 2/6 = 1/3 of a circle with radius 4 cm. The area is thus square centimeters. 3

9 Meet #4 February 2011 Category 2 1. miles. What is the difference (in miles) in the length of their equators? Assume both are perfect spheres, use and round to the nearest whole number. 2. A square is inscribed inside a circle whose radius is inch. How many square inches are in the area of the square? Inscribed means that the squares corners all touch the circle from the inside. 3. The shaded ring-shaped area measures of the outer If the radius of the outer circle is inches, then how many inches are there in the radius of the inner circle?

10 Meet #4 February 2011 Solutions to Category 2 1. formula then the difference is: , we use Pythagoras to see that, and the squares area is simply L 2R 3. respectively. The or in different words, and so. The area of the ring is the same as the area of a circle whose radius is the other leg of the triangle. R r

11 Category 2 Meet #4, February

12 Solutions to Category 2 Meet #4, February The formula for the area of a circle is. If the diameter of the circle is 12 cm, then the radius is 6 cm. The area of the circle is then 2. By drawing in the segment AD, we have an equilateral triangle ABD since all three sides are radii of two circles which are congruent. Since the triangle is equilateral, is. We also know that is supplementary to, so 3. The area of the largest square is cm 2. The diameter of the circle is 14, so its radius is 7 and its area is cm 2. The smaller square is exactly half of the larger square, as shown below, so its area is 98 cm 2. The area of the white region would then be cm 2.

13 Category 2 Meet #4, February In the figure at right, A is the center of the circle and M, T, and H are points on the circle. If the measure of angle MAT is 136 degrees, how many degrees are in the measure of angle MHT? You may use a calculator today! M T A H U F N 2. Right triangle FUN has side lengths 3 units, 4 units, and 5 units. These lengths are the diameters of the three circles that are drawn on each side. How many units are in the curved perimeter of the figure? (By perimeter, we mean the outer-most path around the entire figure.) Use for and round your answer to the nearest hundredth of a unit. 3. The figure below started out as a rectangle that measured 4 feet by 8 feet. The corners were then trimmed to be semicircles with diameter 4 feet. Two circles with diameter 2 feet and one circle with diameter 4 feet were also cut out, as shown. How many square feet are in the area of the shaded figure that remains? Express your answer to the nearest tenth of a square foot

14 Solutions to Category 2 Meet #4, February Angle MAT is known as a central angle and angle MHT is known as an inscribed angle. If a central angle and an inscribed angle both intercept the same arc of the circle (arc MT in this case), then the measure of the inscribed angle is exactly half the measure of the central angle. 2. The curved perimeter of the figure is the sum of the three semicircles, and can be calculated as follows: 3π 2 + 4π 2 + 5π 2 = ( ) π 2 =12 π = 6π = Rounding this value to the nearest hundredth of a unit, we get units. 3. The figure can be thought of as a square and two large semicircles with a large circle and two small circles removed. The area of the two large semicircles is negated by the large circle that is removed. Each small circle has a diameter of two feet, which means a radius of 1 foot and an area of square feet. The remaining area is equivalent to a 4-by-4 square minus two unit circles, which is 16 2, or about 9.7 square feet to the nearest tenth of a square foot. = + + =

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