Question

THE LENGTH OF arc EF is 5pi. what is the radius?

Answer 1

The circumference = (12)(5)(pi) = (60)(pi) because (30)(12) = 360.

(60)(pi) = (2)(r)(pi)

so, r = 30

Answer 2

where did you get 12?

Answer 3

30 degrees is 1/12 of the whole way around the circle. So, if you multiply the arc length by 12, you will get the circumference, the arc length of the whole circle.

30 = 360/12

Answer 4

And then the circumference is (2)(pi)(r)

Answer 5

oh! i get it!

Answer 6

Good luck in all of your studies and thx for the recognition! @Amenah