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The whole surface area of a pyramid whose base is a regular polygon is 260 cm2 and the area of its base is 120 cm2. The area of each lateral face is 20 cm2. Then the number of lateral faces is:

The whole surface area of a pyramid whose base is a regular polygon is 260 cm2 and the area of its base is 120 cm2. The area of each lateral face is 20 cm2. Then the number of lateral faces is: Correct Answer 7

Total surface area = Lateral surface area + Area of Base

260 = Lateral surface area + 120

Lateral surface area = 260 – 120 = 140 cm2

Area of each lateral face = 20 cm2

Number of lateral faces = 140/20 = 7

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