Question

Find the length of an arc of an 8" radius circle if the arc measures 45°

271 in.
871 in.
1671 in.

Answer 1

Explanation:

The appropriate formula here is s = rФ, where Ф is the central angle in radians. We are given r = 8" and Ф = π/4 radians. Then the desired arc length is

s = (8")(π/4), or s = 2π or approximately 6.28". The three given possible answers are 'way off.