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Answers by Carol H.

Let L = the length of the rectangle Let (1/2)L = the width of the rectangle 2L + 2w = P 2L + 2(1/2)L = 63 2L + L = 63 3L = 63 L = 21 inches (1/2)L = (1/2)21 = 10 1/2 inches  

I guess you mean that the surface area of the sphere is 800 cm2. S = 4πr2 800 = 4πr2 200/π = r2    Take the square root of both sides. 7.9788 = r r ≈ 7.98 cm