alleryThe r in the hemisphere formulas is the radius of the:
ABase cone
BParent sphere
CFlat cut only
DCurved edge
Answer & Solution
Correct answer: B. Parent sphere
1. A hemisphere comes from cutting a sphere.
2. Its radius is inherited from that sphere.
3. So r is the radius of the sphere of which it is a part.
_Source: syllabus Mathematics, Chapter 13, Surface Areas and Volumes._
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