anonymous
  • anonymous
A cylinder has a volume of 175pi cubic units and a height of 7 units. The diameter of the cylinder is 5 units 10 units 12.5 units HELP!!!!!!!!! Because I don't understand this at ALL!!!!!!!
Mathematics
schrodinger
  • schrodinger
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Jack1
  • Jack1
Volume of a cylinder = pi x r^2 x h
Jack1
  • Jack1
a diameter is twice the radius... so diameter is 2 x r \(\Large V = \pi \times r^2 \times h \) V = 175pi h = 7 pi =3.1415.... now solve for r then double it
anonymous
  • anonymous
So would you divide everything over the the 175?

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Jack1
  • Jack1
\(\Large V=π×r^2×h\) \(\Large 175\pi=π×r^2×7\) so first... divide both sides by pi then divide both sides by 7 then you should be left with r^2 = ... a number then sqrt both sides and you should be left with r then double it... and that = d
anonymous
  • anonymous
I just got a number like 4,000 and something. I seriously don't understand :( I'm sorry...
anonymous
  • anonymous
OOOH WAIT!
anonymous
  • anonymous
Is the answer 10?
Jack1
  • Jack1
bam! u rock!
Jack1
  • Jack1
yep, d = 10 ;)
anonymous
  • anonymous
Thank you so much! Sorry it took so long lol
Jack1
  • Jack1
all good dude, if it was easy it wouldn't be fun ;)

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