I need help with a geometry problem

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Nov 12th, 2015

Thank you for the opportunity to help you with your question!

Diameter can be go through the following formula

D=√ 4v/hr pie
SO. The volume (πr²h) is 289. We know the height is 21cm  Therefore... 
289 = πr² * 21
πr² = 289 / 21
r² = 289 / (21π) 
r = √(289 / (21π)) 
The diameter is twice the radius, so... 
d =  2√(289 / (21π)) 


d=4

Please let me know if you need any clarification. I'm always happy to answer your questions.
Nov 12th, 2015

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