anonymous
  • anonymous
Find the volume of a cone with radius 6 m and height 20 m. Choose one answer. a. 720π m^3 b. 240π m^3 c. 120π m^3 d. 40π m^3
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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katieb
  • katieb
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anonymous
  • anonymous
@jim_thompson5910 i got 753 and i did all the steps but no right answer... help me?
jim_thompson5910
  • jim_thompson5910
Area of the base = ???
phi
  • phi
Did you use \[ V= \frac{1}{3} \pi r^2 h \]

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anonymous
  • anonymous
@jim_thompson5910 sorry i had to run some errands for my mom but the area of the base is 113.04
anonymous
  • anonymous
@jim_thompson5910 am i right?
jim_thompson5910
  • jim_thompson5910
yes
jim_thompson5910
  • jim_thompson5910
now multiply that with the height
anonymous
  • anonymous
2260.8
jim_thompson5910
  • jim_thompson5910
then divide by 3
anonymous
  • anonymous
i still got 753.6!
anonymous
  • anonymous
thats wrong!
jim_thompson5910
  • jim_thompson5910
ok which matches to which answer
jim_thompson5910
  • jim_thompson5910
i know, each answer has a pi in it
jim_thompson5910
  • jim_thompson5910
one of those answers is roughly equal to 753.6
anonymous
  • anonymous
720
anonymous
  • anonymous
?
jim_thompson5910
  • jim_thompson5910
no, try doing the calculations without 3.14 and use pi instead
anonymous
  • anonymous
k
anonymous
  • anonymous
i really dont know i did and i got 753.98223687 this time
phi
  • phi
when you find the area using \[ \pi r^2\] leave pi in. do not use 3.14 you get \[ 36 \pi\]
anonymous
  • anonymous
i dont have my graphing calc right now so im using a scientific one right now
anonymous
  • anonymous
but ohk yes i got 36
phi
  • phi
V= 1/3 pi r^2 h if you leave the pi to one side: \[ \pi (\frac{1}{3} 36 \cdot h )\] just figure out the stuff in the parens
anonymous
  • anonymous
i got 240 woowww how'd yo do that... how was i getting 753?
anonymous
  • anonymous
I got B for this is that right? Find the volume of a square pyramid with base edges 4 ft. and height 15 ft. Choose one answer. a. 20 cu. ft b. 80 cu. ft c. 240 cu. ft d. 60 cu. ft
phi
  • phi
the answer is \[ 240 \cdot \pi \] 240 times pi if you replace pi with 3.14159... you get 753. with lots of decimals people just write it 240 pi and if someone wants the exact number, they can multiply it out themselves.
phi
  • phi
Yes to b. 80 cu. ft
anonymous
  • anonymous
oh ohk thanks a lot can you check my answer above?
anonymous
  • anonymous
thanks :)

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