math-PLEASE CHECK

Find the surface area and volume of each of the following
figures:
d.Right circular cylinder
v=pir^2h
pi(3)(3)(6)
pi(54)
v=169.6 cubic cm

sa=2pi r^2 + 2pi rh
2pi(3)(3)+2pi(3)(6)
2pi(9)+2pi(18)
56+113=169
Sa=169 square cm
is this right???

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  1. correct

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    posted by Reiny
  2. Thank you Reiny. I thought I followed the steps correctly but I wasn't sure since they were almost the same answer. Thanks.

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    posted by crystal
  3. They were the same answers since in effect your cylinder had the same diameter as its height.

    It would not have happened otherwise

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    posted by Reiny
  4. i understand now. thanks for explaining!!!

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    posted by crystal
  5. If i was doing the pythagorean theorum and i had a triangle with a radius of 3 and height of 6 would this be the answer???
    c^2=3^2+6^2
    c^2=9+36
    c^2=45
    c=6.7

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    posted by crystal
  6. I don't know what you mean by the radius of a triangle ?

    If the two short sides are 3 and 6 and you are finding the hypotenuse, your solution is correct.

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    posted by Reiny
  7. thank you. sorry it was for a right circular cone that we had to use the pythagorean theorum for. would the answer still be correct?

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    posted by crystal

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