The derivation of the formula of pyramid can be gained easily based on the formula for a triangular prism. A pyramid is like two prisms joined together.
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The answer depends on the what characteristic of the pyramid you want the formula for: its surface area, its volume or something else.
The formula for finding the volume for a triangular pyramid is half base x height x length. A triangular pyramid has four faces.
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from a pyramid
The volume of a cube is V = x3. The derivative of this is (d/dV)x = 3x2.