anonymous 4 years ago an arc of length 12 meters is formed by a central angle A on a circle of r=9 the measure of A in degrees(2 decimal places() is a. 42.97 b. 8.38 c. 76.39 d. 1.30

1. anonymous

b maybe?

2. anonymous

$s = r \theta$ Solve for theta. $\theta = s/r$ $\theta = 1.3333$ So your answer is D

3. anonymous

it was c

4. anonymous

First, find the circumference of the circle. Then, find the ratio of arc to circumference. Then, use this ratio against 360 degrees to find the angle A.

5. anonymous

circumference of circle = 2*p1*9 = 18 pi required angle = 12* 360 ------- 18 pi = 240 / pi = 76.39 degrees