Question

A washing two in the shape of a frustum of a cone has height 21 cm. The radii of the
circular top and bottom are 20cm and 15 cm respectively. What is the capacity of the
tub? (​

Answer 1

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Given that,

Height h=21cm

Top radius R=20cm

Bottom radius r=15cm

Capacity of the tub = Volume of frustum of the cone

=

3

1

πh(R

2

+r

2

+Rr)

=

3

1

×

7

22

×21×(20

2

+15

2

+20×15)

=22×(400+225+300)

=22×925

=20350cu.cm

=20.350l (Ans)