The height of a cone, a cylinder and a sphere are equal numerically. If the ratio of their radii is 1:3:5, then find the ratio of their volumes?
Answer & explanation
Correct answer: option 1
since in a sphere, height = diameter :-
Cone Cylinder Sphere
Ratio of radius 1 : 3 : 5
Ratio of height 1 : 1 : 1
⇒ height of cone and cylinder = diameter of sphere
Ratio of volume \(\frac{1}{3}\) \(\pi \)r12h1 : \(\pi \)r22h2 : \(\frac{4}{3}\) \(\pi \)r33
⇒ \(\frac{1}{3}\) \(\pi \)x2 × \(\frac{5x}{2}\) : \(\pi \)(3x)2 \(\frac{5x}{2}\) : \(\frac{4}{3}\) \(\pi \) 5x)2
⇒ \(\frac{5}{6}\) : \(\frac{9 × 5}{2}\) : \(\frac{4}{3}\) × 125
= 1 : 27 : 200