MA-663

Finding an unknown in a formula

Lower Sec Maths · Secondary 2 · Hard · Finding an unknown in a formula

A frustum of a cone has height 12 cm. The radius of its top circular surface is 3 cm and the radius of its base is 5 cm.

Using the volume formula for a frustum,

V = \dfrac{1}{3}\pi h(R^2 + Rr + r^2)

, find its volume in

\text{cm}^3

, correct to 1 decimal place.

615.8 $\text{cm}^3$
307.9 $\text{cm}^3$
392.7 $\text{cm}^3$
784.0 $\text{cm}^3$

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