NCERT Exemplar Mathematics - Class 9>Surface Areas and Volumes>Surface Area of a Sphere

Surface Area of a Sphere

Author:NCERT

9th CBSE

IMPORTANT

Surface Area of a Sphere: Overview

This topic contains the problems based on finding the surface area of a sphere using formula. It comprises subjective and objective type questions related to the calculation of surface area with a given radius.

Important Questions on Surface Area of a Sphere

EASY

IMPORTANT

NCERT Exemplar Mathematics - Class 9>Surface Areas and Volumes>Surface Area of a Sphere> Q 1

The radius of a hemispherical balloon increases from $6 cm$ to $12 cm$ as air is being pumped into it. The ratio of the surface areas of the balloon in the two cases is