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The whole surface area of a pyramid whose base is a regular polygon is 340 cm² and area of its base is 100 cm². Area of each lateral face is 30 cm². Then the number of lateral faces is
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- 8
- 9
- 7
- 10
- 8
Correct Option: A
Total surface area = Lateral surface area + area of base
⇒ 340 = Lateral surface area + 100
⇒ Lateral surface area = 340 – 100 = 240 sq. cm.
Area of each lateral surface = 30 sq. cm.
∴ Number of lateral surfaces = 240/30 = 8
