The radii of two circular faces of a frustum of a cone are 12 cm and 9 cm. If the height of the frustum is 21 cm, find its volume. -
Answer & explanation
Correct answer: option 2
Volume of frustum = \(\frac{\pi h}{3}\) (R² + Rr + r²) = \(\frac{22 \times 21}{7 \times 3}\) (144 + 108 + 81)
= 7326 cm³