The study of surface areas is extended here to spheres and:
ACubes
BPrisms
CDiscs
DCones
Answer & Solution
Correct answer: D. Cones
1. Cuboids, cubes and cylinders were covered before.
2. Two further solids are taken up.
3. They are cones and spheres.
_Source: NCERT Class 9 Mathematics, Chapter 13, Surface Areas and Volumes._
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