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The circumference of a hollow ball is 29cm What is the surface area?
Wiki User
∙ 14y ago
2 x pi x radius = circumfrance
2 x pi x radius = 29
29/ 2pi = radius
radius = 4.62 (3 sig.fig.)
4 x pi x radius^2 = Surface area of sphere
12.56 x radius^2 = Surface area of sphere
12.56 x 4.62^2 = Surface area of sphere
268 cm2 (3 sig.fig)
Wiki User
∙ 14y ago
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