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Find the surface area of the cone to the nearest tenth.

Mathematics
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1 Attachment
A. 203 cm2 B. 1341.5 cm2 C. 747.7 cm2 D. 213.5 cm2
  • phi
here is the formula http://math.about.com/od/formulas/ss/surfaceareavol_2.htm

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Other answers:

  • phi
can you match your numbers to the variable names in the formula?
i got 441 pi but thats not right..
i did 1/3 pi 7^2 27 .. what did i do wrong?
ooops i did the volume formula thats why!
this time i got 238 thats still not right ...
  • phi
\[ area = \pi r^2 + \pi r s\] r is 7 and s is 27 is that what you started with ?
  • phi
it looks like you did not multiply by pi
im still getting 238 -_-
i did pi*7^2 + pi 7 * 27
  • phi
238 is r^2 + r*s the formula is pi r^2 + pi*r*s or pi*(r^2 + r*s)
  • phi
7*7 is 49 7*27 is 189 add together you get 238 no pi
  • phi
can you figure out how to do it?
okay i get that
for pi * 7^2 i got 153.86
for pi * 7 * 27 i got 593.46
so would it be C ???
  • phi
yes, I thought you figured it out already.
okay so it is C?
  • phi
btw, you should not round to only 2 decimals, because your answer is slightly off. if you used all the digits the calculator gives you you get 747.6990516 which rounds to 747.7
okay thank you so much for your help!!!
  • phi
yw

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