3. Find the volume and lateral surface area of the frustum of a regular square pyramid whose altitude is 38 cm and whose base edges are 10 cm and 20 cm respectively.
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Expert's answer
2020-12-07T20:14:39-0500
We know that ,if a,b and h are the base edge,top edge and height of a frustum of a regular square pyramid,then formula for volume and lateral surface area are -
Volume(V)=(1/3)(a2+b2+ab)×h
Lateral surface area(F)=2(a+b)(((a−b)/2)2+h2)
Now according to the given problem,
a=20cm , b=10cm ,h=38cm
Therefore required volume of the frustum of square pyramid is
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