the slant height of a frustum of a cone is 4 cm and the perimeter circumference of its circular end is 18cm and 6 cm. fibd the surface area of a frustum
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The slant height of a frustum of a cone is 4 cm and the perimeters (circumference) of its circular ends are 18 cm and 6 cm. Find the curved surface area of the frustum. Let R and r be the radii of bigger and smaller ends of the frustum, and l be the slant height, then l = 4cm. = 48 cm2.
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