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A solid metallic cone is melted and recast into a solid cylinder of same base as that of cone. If the height of the cylinder was 7 cm, the height of the cone is: |
20 cm 21 cm 10 cm 12 cm |
21 cm |
Vol of cone = vol of cylinder ⇒ \(\frac{1}{3}\)\(\pi \) r2h = \(\pi \) r2H ⇒ \(\frac{1}{3}\)\(\pi \) r2h = \(\pi \) r2× 7 ⇒ h = 21 cm. |
