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Area of Square Pyramid(Vic)

Area of Square Pyramid
The sides of the polygon forming the base of a pyramid are called its base edges and the other sides of the triangles are called lateral edges. The top end of a pyramid is called its apex. By the height of a pyramid, we mean the perpendicular distance from its apex to its base. What is the surface area of a square pyramid with base edges 20 centimetres and lateral edges 15 centimetres?