If in the frustum of a cone the diameter of the upper base equals the slant height, find the lateral area (a) if the altitude is 4 in. and the perimeter of a vertical section through the axis is 26 in.; (b) if the altitude is 7.2 in. and the perimeter is 39.2 in.

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A: Let's find.

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A: NOTE Since we only answer up to 3 sub-parts, we’ll answer the first 3. Please resubmit the question…