Question

Use the arc length formula and the given information to find r.

Answer 1

Answer:

Step-by-step explanation:

The thing with the arc length formula, s = rt, is that t is the angle in radians.  Ours is in degrees, so we have to change it:

36 × $\frac{\pi }{180}=\frac{\pi }{5}$

So the formula we use to solve for r is:

$12=\frac{\pi }{5}r$

Multiply both sides by 5 over pi to get that

$r=\frac{60}{\pi } cm$