Answer:
The answer is r = 4/θ.
Step-by-step explanation:
Given that the formula of arc is, s = rθ where s is the length of arc and r is the radius of circle. Then you substitute the following value into the equation :
s = 4
r = r (unknown)
4 = r × θ
Make r the subject :
4 = rθ
r = 4/θ
