Oreos1109 Oreos1109

09-03-2018
Mathematics

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A cylinder with a radius of 1 cm and a height of 21 cm has the same volume as a cone with a height of 7 cm. What is the radius of the cone? A) 3 cm B) 5 cm C) 7 cm D) 9 cm

No guessing tyvm!

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stevesjane stevesjane

17-03-2018

option A is correct.

volume of cylinder = volume of cone
(22/7)(1^2)(21) =(1/3)(22/7)(r^2)(7)
9 =r^2
therefore radius = 3cm.

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