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OpenStudy (anonymous):
the surface area of a cone that has a true height of 11 inches and the base has a radius of 4.5 inches.
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OpenStudy (anonymous):
the formula for the surface area of a cone is \[\pi R \sqrt{R^2+H^2}\] where R is radius and H is height. If by true height you mean length of the side, use trigonometric functions (or pythagorean theorem) to find the height of the cone.
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