Philip P. answered • 06/15/18

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Let r = the radius of circle A. The radius of circle B is twice as big (2r). Their circumferences are:

C

_{A}= 2 pi rC

_{B}= 2 pi 2r = 4 pi rC

_{A}+ C_{B}= 2 pi r +4 pi r81 pi = 6 pi r

Solve for r. The diameter of circle B is 2(2r) = 4r.

Momina AbdulQadir G.

06/15/18