Answer:
62.83
because you take 20, divide it by 2 to get the radius then you have the equation 2π(10)
15
Step-by-step explanation:
(1/2) / (1/12)
(1/2) * (12/1) = 12/2 = 6
-8x^2+26x-21
3x : 2 = 15
3x = 15 * 2
3x = 30
x = 30 : 3
x = 10
--------------------------------
3(10) :2 = 15
