Which are solution of
​

Given a circle with measures of (c, d, and r) and a circle with measures of (c', d', and r'), what is d if c c' = 12 and d' = 0.50? a) 3 b) 6 c) 12 d) 24

Can someone me do math because i am having a breakdown rn because i don’t get it

Ijust need these 2 questions answered (the second pic is just confirmation i'm not confident in that answer)