1.

The diameter of a spherical ball is 21 cm. How much leather is required to prepare5such balls.

Answer»

d=21 cm

r= d/2= 21/2cm

surface area of 1 sphere= 4*22/7*r*r

= 4*22/7*21/2*21/2

=22*3*21

=1386cm²

now for 5 balls = 5*1386 cm³

=6930 cm² of leather is required



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