Question

Can somebody explain how to get the answer/ what formula, and the answer??

Answer 1

R = 9 cm

Explanation:

C = 2ПR

Also C = 18П сm

2ПR = 18П

R = 18П/2П = 9 сm

Answer 2

9 cm

Explanation:

divide the total circle centimeter which is 18 in half. Half of 18 is 9 so the diameter is 9.