Consider a regular square pyramid
Let a= the base edge, h= the altitude, and s= the slant height.
The volume V of the frustum of a regular square pyramid is
V=31a2hThen
a=h3V=123(196)=7(m)
By the Pythagorean Theorem from the right triangle
s2=(2a)2+h2
s=(2a)2+h2=(27)2+(12)2=12.5(m)
12.5 m
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