Question

the diameter of a spherical ball is 21cm how much leather is required to prepare 5 such balls

Answer 1

Solution:-
Diameter of the spherical ball = 21 cm 
So, radius = 21/2 = 10.5 cm
Surface area of the sphere = 4πr²
= 4 × 22/7 × 10.5 × 10.5
Surface area of one spherical ball = 1386 sq cm
So, the required leather to make one spherical ball is 1386 sq cm.
Therefore, to make 5 such spherical balls, leather will be required
= 5 × 1386
= 6930 sq cm 
Answer.

Answer 2

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