Surface area of a rectangular pyramid | Geometry (TX TEKS) | Khan Academy

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https://www.khanacademy.org/math/geometry-tx/x790e3ac3e338c450:measurement-of-3d-figures/x790e3ac3e338c450:surface-area/v/surface-area-of-a-rectangular-pyramid

Given a right rectangular (non-square) pyramid with the dimensions of the base and the height of the pyramid, let's find the lateral and total surface area. We'll use the Pythagorean theorem to find the slant heights of the lateral faces.

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