Need help understanding volumes of cones

  • Thread starter Kirito123
  • Start date
  • #1
125
14

Homework Statement


This was a example but I didn't quite understand it, I don't know how they ended up with 565.49 every time I try I get some random other number.
upload_2016-5-11_17-11-21.png

Homework Equations


upload_2016-5-11_17-11-46.png


The Attempt at a Solution


So this is how i do it.

upload_2016-5-11_17-13-52.png

Pi (6) 2 (15)/3

So first I multiply 3.14 (pi) by 6. so 3.14 x 6 = 18.84.
Now 18.84 to the power of 2 is equal to 354.9456
354.9456 x 15 = 5324.184
5324.184 / 3 = 1774.728.

I know im wrong but i just want to know how come when i try to calculate the volume it doesn't work???
 

Answers and Replies

  • #2
SammyS
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Homework Statement


This was a example but I didn't quite understand it, I don't know how they ended up with 565.49 every time I try I get some random other number.
View attachment 100590

Homework Equations


View attachment 100591

The Attempt at a Solution


So this is how i do it.

View attachment 100592
Pi (6) 2 (15)/3

So first I multiply 3.14 (pi) by 6. so 3.14 x 6 = 18.84.
Now 18.84 to the power of 2 is equal to 354.9456
354.9456 x 15 = 5324.184
5324.184 / 3 = 1774.728.

I know im wrong but i just want to know how come when i try to calculate the volume it doesn't work???
You are squaring π as well as squaring r.

Review ' Order of Operations '.
 
  • #3
125
14
ok i get it now, thx alot.
 

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