alleryThe surface area of a sphere of radius r is:
A2 pi r squared
B3 pi r squared
Cpi r squared
D4 pi r squared
Answer & Solution
Correct answer: D. 4 pi r squared
1. The sphere's surface area is fixed by its radius alone.
2. The formula carries a factor of four.
3. It is 4 pi r squared.
_Source: syllabus Mathematics, Chapter 13, Surface Areas and Volumes._
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