Q. 9 I5.0( 1 Vote )

# The radii of a frustum of a cone are 5 cm and 9 cm and height is 6 cm, then the volume is ………….. cm^{3}.

A. 320π

B. 151π

C. 302π

D. 98π

Answer :

Volume of frustum = h[R^{2} + r^{2} + Rr]

= × 6 cm[(9cm)^{2} + (5cm)^{2} + 9cm × 5cm]

= 2π [81cm^{2} + 25cm^{2} + 45cm^{2}]

= 2π × 151cm^{2}

= 302 cm^{2}

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