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Oh, dude, you're hitting me with some math here. So, the formula for the surface area of a sphere is 4πr², where r is the radius. Since the diameter is 18 cm, the radius is half of that, which is 9 cm. Plug that into the formula, and you get a surface area of 1017π cm². But like, who's really gonna measure that in real life, am I right?
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ViviThe formula for the surface area of a sphere is 4πr^2, where r is the radius of the sphere. Since the diameter is 18 cm, the radius would be half of that, which is 9 cm. Plugging this into the formula, we get 4π(9)^2 = 4π(81) = 324π cm^2. Therefore, the surface area of the sphere is 324π square centimeters.
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