The 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: NCERT Class 9 Mathematics, Chapter 13, Surface Areas and Volumes._
Related questions
The study of surface areas is extended here to spheres and:Which solids were studied in earlier classes for surface area and volume?The r in the hemisphere formulas is the radius of the:The total surface area of a hemisphere of radius r is:A solid hemisphere has how many faces?The curved surface area of a hemisphere of radius r is:The curved surface area of a hemisphere is what fraction of the sphere's?Cutting a sphere into two equal halves gives two: