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Question

A lateral faces of a square pyramid are equilateral triangles of side 30 centimetres. What is its surface area?

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Solution

Side of the equilateral triangle = 30 cm

Side of the square = Side of the equilateral triangle = 30 cm

Area of the square = (side)2 = (30 cm)2 = 900 cm2

Area of one equilateral triangle =

Area of four equilateral triangles =

Surface area of the square pyramid = Area of square + Area of four equilateral triangles

= (900 + ) cm2


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