ErinWeeks
  • ErinWeeks
Find the surface area of the cone to the nearest tenth.
Mathematics
schrodinger
  • schrodinger
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ErinWeeks
  • ErinWeeks
1 Attachment
ErinWeeks
  • ErinWeeks
A. 203 cm2 B. 1341.5 cm2 C. 747.7 cm2 D. 213.5 cm2
phi
  • phi
here is the formula http://math.about.com/od/formulas/ss/surfaceareavol_2.htm

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

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