2014 · Q87
For the next three (3) items that follow: A right triangle having hypotenuse 25 cm and legs in the ratio 3 : 4 is made to revolve about its hypotenuse. (π = 3.14) What is the volume of the double cone so formed?
Elementary MathematicsMensuration
- A3124 cm³
- B3424 cm³
- C3768 cm³
- D3924 cm³
Explanation
Legs are 15 cm and 20 cm; common radius r = 15·20/25 = 12 cm, heights sum to 25 cm: V = (1/3)π·144·25 = 1200π = 3768 cm³.