alleryA prism has 10 faces. What polygon forms its base?
APentagon
BDodecagon
CDecagon
DOctagon
Answer & Solution
Correct answer: D. Octagon
1. A prism has 2 bases plus one side face for each base side.
2. Let the base have n sides: faces = n + 2.
3. Then n + 2 = 10, so n = 8.
4. A polygon with 8 sides is an octagon.
_Source: Math Is Fun, Prisms (mathsisfun.com/geometry/prisms.html), Sides_
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