Question

Use the arc length formula and the given information to find r.
s = 12 cm, _ = 36Á; r = ?

Answer 1

60/pi

Explanation:

12=2*pi*r*(36/360)

12=2*pi*r*(1/10)

r=16/1*15/4pi= 60/pi

r=60/pi

Answer 2

the answer is
s= r x teta, teta = 36Á= 0.62 rad
so r = s / teta , r = 12/0.62 = 19.35 cm