Mid-Chapter Quiz: Lessons 10-1 through Refer to. 1. Name the circle. SOLUTION: The center of the circle is A. Therefore, the circle is ANSWER:
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1 Refer to. 1. Name the circle. The center of the circle is A. Therefore, the circle is 2. Name a diameter. ; since is a chord that passes through the center, it is a diameter. 3. Name a chord that is not a diameter. ; the chord does not pass through the center of the circle, so it is not a diameter. esolutions Manual - Powered by Cognero Page 1
2 4. BICYCLES A bicycle has tires that are 24 inches in diameter. a. Find the circumference of one tire. b. How many inches does the tire travel after 100 rotations? a. Therefore, the circumference of one tire is about 75.4 inches. b. Therefore, the tire travels about 7540 inches in 100 rotations. a in. b in. Find the diameter and radius of a circle with the given circumference. Round to the nearest hundredth. 5. C = 23 cm Use the circumference to find the diameter. Therefore, the diameter is about 7.32 centimeters. The radius is half the diameter. So, the radius of the circle is (7.32) or about 3.66 centimeters cm; 7.32 cm esolutions Manual - Powered by Cognero Page 2
3 6. C = 78 ft Use the circumference to find the diameter. Therefore, the diameter is about feet. The radius is half the diameter. So, the radius of the circle is (24.83) or about feet ft; ft 7. MULTIPLE CHOICE Find the length of. A B 2.20 cm C D cm The minor arc adjacent to arc BC has a measure of 168, since it is equal to its related central angle. This arc and arc BC form a semicircle. The diameter is 21 centimeters, so the radius is (21) or 10.5 centimeters. Use m = 12 and r = 10.5 to find the length of arc BC. Therefore, the lenth of arc BC is about 2.20 centimeters. So, the correct choice is B. B esolutions Manual - Powered by Cognero Page 3
4 8. MOVIES The movie reel shown below has a diameter of 14.5 inches. a. Find. b. Find the length of. a. The measure of an arc is equal to its related central angle. Since the central angle related to arc ADC is 240, the measure of arc ADC is 240. b. Use m = 240 and r = (14.5) or 7.25 to find the length of arc ADC. Therefore, the length of arc ADC is about 30.4 inches. a. 240 b in. Find the value of x. 9. The sum of the measures of the arcs of a circle is esolutions Manual - Powered by Cognero Page 4
5 10. In, CE = Find BD. Round to the nearest hundredth. Since is a radius and is perpendicular to the chord, it bisects. So, CD = (13.5) or Draw radius to complete right triangle BCD. Use the Pythagorean Theorem to find BD The two circles shown are congruent. Find x and the length of the chord. In the same circle or in congruent circles, two minor arcs are congruent if and only if their corresponding chords are congruent. Here, the measure of the minor arc in the second circle is or 76. So, the minor arcs in the two circles are congruent. Then, the corresponding chords are also congruent.\ Use the value of x to find the length of each chord. 3x 7 = 3(16) 7 or 41 Therefore, the value of x is 16 and the length of each chord is 41. x = 16; 41 esolutions Manual - Powered by Cognero Page 5
6 12. Find each measure. TVU is an inscribed angle. Therefore, the measure of arc TU is A is an inscribed angle. Therefore, the measure of A is esolutions Manual - Powered by Cognero Page 6
7 14. MULTIPLE CHOICE Find x. F 1.8 G 5 H 46 J 90 If two inscribed angles of a circle intercept the same arc or congruent arcs, then the angles are congruent. Therefore, the correct choice is G. G 15. If a square with sides of 14 inches is inscribed in a circle, what is the diameter of the circle? When a square is inscribed in a circle, each diagonal of the square will be a diameter. Use the Pythagorean Theorem to find the length of a diagonal. Therefore, the diameter of the circle is in. esolutions Manual - Powered by Cognero Page 7
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