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For a smooth toy, the cone base radius must equal that of the:
AHemisphere
BFull sphere
CFlat square
DLong cuboid
Answer & Solution
Correct answer: A. Hemisphere
1. The two flat faces are brought together at the join.
2. A mismatch would leave a ridge at that seam.
3. So the two radii are taken equal.
_Source: NCERT Class 10 Mathematics, Chapter 13, Surface Areas and Volumes._
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