SSC CGL 11 Jun 2019 Shift 1 Paper

Question : 60 of 100

Marks: +1, -0

The radii of two circular faces of the frustum of a cone of height 21 cm are 3 cm and 2 cm respectively. What is the volume of the frustum of the cone in cm

^{3}

(\π=22/7)

Validate

Solution:

volume of a truncated come

\ {V}=\ {1}/{3} \πh\ (R^{2}+r^{2}+R . r\ )

=\ {1}/{3} \× \ {22}/{7} \×21 \×\ (3^{2}+2^{2}+3 \×2\ )

=418 \ {\cm}^{3}

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