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If 1 gallon of paint covers 400 square feet about how many gallons of paint are needed to paint the outside of a spherical tank of diameter 20 feet?
Wiki User
∙ 14y ago
Surface area of a sphere = 4*pi*radius2
Area = 4*pi*102 = 400*pi square feet
Amount needed in gallons = (400*pi)/400 = pi (3.141592654)
Just over 3 gallons will be needed.
Wiki User
∙ 14y ago
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