April 28, 2017 Geometry 11.1 Circumference and Arc Length
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1 11.1 Warmup April 28, 2017 Geometry 11.1 Circumference and Arc Length 1
2 Geometry 11.1 Circumference and Arc Length
3 11.1 Essential Question How can you find the length of a circular arc? April 28, 2017 Geometry 11.1 Circumference and Arc Length 3
4 Goals Find the circumference of a circle. Find the length of an arc. Solve problems using circumference and arc length. arc April 28, 2017 Geometry 11.1 Circumference and Arc Length 4
5 Circumference The circumference is the distance around a circle. April 28, 2017 Geometry 11.1 Circumference and Arc Length 5
6 Pi π d The ratio of the circumference to the diameter is called pi π. Use the Greek letter for pi: C C d April 28, 2017 Geometry 11.1 Circumference and Arc Length 6
7 More About Pi The fraction 22/7 is close. 355/113 is closer. The Hebrews thought it was 3. Current computer calculations have pi to over 5 trillion places. April 28, 2017 Geometry 11.1 Circumference and Arc Length 7
8 Pi to a few decimal places: April 28, 2017 Geometry 11.1 Circumference and Arc Length 8
9 Pi is Irrational does not repeat. does not terminate. There is NO algebraic technique than can be used to find its value. Computing requires the use of calculus. April 28, 2017 Geometry 11.1 Circumference and Arc Length 9
10 Circumference You can find the circumference if you know the diameter (d) or the radius (r) of the circle. C C 2 d r April 28, 2017 Geometry 11.1 Circumference and Arc Length 10
11 Example 1 Find the circumference of a circle with a radius of 8. C 2 (8) This is the circumference in terms of pi. When computing C in decimal, use 3.14 or the π button on your calculator. April 28, 2017 Geometry 11.1 Circumference and Arc Length 11
12 Arc Length The ratio of the length of an arc to the circumference of a circle is equal to the ratio of the measure of the arc⁰ to 360. A B Arc Length of AB mab 2r 360 Recall: the measure of the arc is equal to the central angle that intercepts it. April 28, 2017 Geometry 11.1 Circumference and Arc Length 12
13 Example 2 Find the length of AB. A Write the proportion: L B 80 5 Length of Arc Circumference of circle L 80 2 (5) 360 Central Angle April 28, 2017 Geometry 11.1 Circumference and Arc Length 13
14 Solve the proportion L 80 2 (5) 360 L L 20 L 6.98 B A 80 5 L April 28, 2017 Geometry 11.1 Circumference and Arc Length 14
15 Your Turn Find the length of AB B x A 25 8 x 25 2 (8) 360 x x 400 x x April 28, 2017 Geometry 11.1 Circumference and Arc Length 15
16 Example 3 A 25 x B 10 The length of AB is 25 and the radius is 10. Find the mab. 25 x 2 (10) x x 20 x April 28, 2017 Geometry 11.1 Circumference and Arc Length 16
17 Semicircle Half of a circle. Its measure is 180. Its length is one-half the circumference. April 28, 2017 Geometry 11.1 Circumference and Arc Length 17
18 Example 4 An indoor track at a gym has the design below. What is the length of the entire track? 40 ft 100 ft April 28, 2017 Geometry 11.1 Circumference and Arc Length 18
19 Example 4 Solution The ends make one circle. The diameter is 40 ft. C = (40) 40 ft 100 ft April 28, 2017 Geometry 11.1 Circumference and Arc Length 19
20 Example 4 Solution Add 200 for the straight segments. Perimeter = ft Or, ft. 40 ft 100 ft April 28, 2017 Geometry 11.1 Circumference and Arc Length 20
21 Practice 1 The circumference of a circle is 200 ft. Find its radius. C 2 r r r r April 28, 2017 Geometry 11.1 Circumference and Arc Length 21
22 Practice 2 The radius of a circle is 16 in and central angle ACB measures 42. Find the length of arc AB. x 42 2 (16) (16)(42) x 360 x April 28, 2017 Geometry 11.1 Circumference and Arc Length 22
23 Practice 3 An arc of a circle has a length of 12 cm. Its central angle is 15. What is the radius of the circle? r (15) r 12(360) 30 r 4320 r r April 28, 2017 Geometry 11.1 Circumference and Arc Length 23
24 Practice 4 A circle has a diameter of 20 cm. An arc on the circle is 10 cm in length. Find the measure of the central angle. 10 x 2 (10) x 3600 x x April 28, 2017 Geometry 11.1 Circumference and Arc Length 24
25 Summary The length of an arc on a circle is proportional to the measure of the arc and to the central angle. A semicircle has 180 and it s length is half the circumference. April 28, 2017 Geometry 11.1 Circumference and Arc Length 25
26 Homework April 28, 2017 Geometry 11.1 Circumference and Arc Length 26
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