A truncated pyramid is the result of cutting a pyramid by a plane parallel to the base and separating the part containing the apex.

The lateral faces of a truncated pyramid are trapezoids.

The height of a truncated pyramid is the perpendicular distance between the bases.

The apothem is the height of any of its sides.

Unfold of a Truncated Pyramid

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Calculation of the Apothem of a Truncated Pyramid

To calculate the apothem of a truncated pyramid, the height, the apothem of the biggest base and the apothem of the minor base must be known. Apply the Pythagorean theorem to determine the length of the hypotenuse of the red triangle to obtain the apothem:

Area and Volume of a Truncated Pyramid

Example

Calculate the lateral area, surface area and volume of the truncated square pyramid whose larger base edge is 24 cm, smaller base edge is 14 cm and whose lateral edge is 13 cm.

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Emma

I am passionate about travelling and currently live and work in Paris. I like to spend my time reading, gardening, running, learning languages and exploring new places.