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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