Need help on this ! ‼️

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

How many solutions does the nonlinear system of equations graphed below have?

The area of a circle is equal to 1 dm². find the radius of the circle.