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 ………….. cm3.A. 320πB. 151πC. 302πD. 98π

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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