alleryThe curved surface area of a cone is pi times its slant height times its:
ABase radius
BFull height
CBase diameter
DWhole volume
Answer & Solution
Correct answer: A. Base radius
1. Cutting and flattening the cone gives a sector of a circle.
2. Its area works out as half of the base circumference times the slant height.
3. That is pi times r times l, with r the base radius.
_Source: syllabus Mathematics, Chapter 13, Surface Areas and Volumes._
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