alleryA pyramid has 8 faces in all. How many sides does its base have?
A7
B5
C8
D6
Answer & Solution
Correct answer: A. 7
1. A pyramid has 1 base face plus one triangle for each base side.
2. Let the base have n sides: faces = n + 1.
3. Then n + 1 = 8, so n = 7.
4. The base is a heptagon.
_Source: Math Is Fun, Pyramids (mathsisfun.com/geometry/pyramids.html), Parts of a Pyramid_
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