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Question

If a piece of cloth costs 10/m2, then find the total cost to build a square pyramid tent of base edge 10 m and slant height 10 m.

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Solution

Given:
Cost of the cloth=10/m2
Base edge of square pyramid = 10 m
Slant height of square pyramid = 10 m

The amount of cloth required to build the pyramid will be the lateral surface area of the pyramid.

Lateral surface area of the square pyramid
=4×(12×base edge×slant height)

=4×12×10×10

=200 m2

Hence, the total amount of money required
=10×200= 2000


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