Chapter 14 - Mensuration

Example 3. If the radii of the circular ends of a bucket, 45cm high, are 28cm and 7cm, find the capacity of the bucket.

Solution:- Height, h = 45cm

Radius, R = 28cm

Radius, r = 7 cm

capacity of the bucket

= 1/3 X 22 X 45 X 7 X 21

= 48510 cm³

Example 4. A solid sphere of radius 3cm is melted and then cast into small spherical balls each of diameter 0.6cm. Find the number of small balls thus obtained.

Solution:- Let number of small balls be x

Volume of x small balls = Volume of sphere