Q9 of 48 Page 270

The radii of a frustum of a cone are 5 cm and 9 cm and height is 6 cm, then the volume is ………….. cm3.

Volume of frustum = h[R2 + r2 + Rr]


= × 6 cm[(9cm)2 + (5cm)2 + 9cm × 5cm]


= 2π [81cm2 + 25cm2 + 45cm2]


= 2π × 151cm2


= 302 cm2

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