anonymous
  • anonymous
Find the surface area of the figure below. A. 203.1 ft2 B. 301.59 ft2 C. 318.74 ft2 D. 395.84 ft2 i am so confused on this .. i am trying to use the c^2=b^2 and a^2 different ways but its just not working out . what am i doing wrong ?
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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chestercat
  • chestercat
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anonymous
  • anonymous
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anonymous
  • anonymous
@gaara438125
anonymous
  • anonymous
we need to find the height first, which i believe we already found was 16.16 correct?

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anonymous
  • anonymous
this is a completely different question than before . lol . i'm so unsure with this one .
anonymous
  • anonymous
ok i see what's different :P we need to find a side (the height) we know the hypotenuse (the slant) and one side so b^2 = c^2 - a^2 c = 15 a = 6
anonymous
  • anonymous
my answer was 189 . what do i do from there ? because that answer isn't available in the answer choices .
anonymous
  • anonymous
@gaara438125 @JakeV8 @Grim0519
anonymous
  • anonymous
You were close... just not done with the last step on finding that length: b^2 = c^2 - a^2 c = 15 a = 6 b^2 = 225 - 36 b^2 = 189 But you want "b", not "b squared"... you forgot to take the square root of 189.
mayankdevnani
  • mayankdevnani
do you know the surface area of cone=?
anonymous
  • anonymous
But then, yeah, you need surface area, not just the length of the outside edge. I don't have that formula handy...
mayankdevnani
  • mayankdevnani
you are right @JakeV8
anonymous
  • anonymous
the square root of 189 is : 13.7477270849
anonymous
  • anonymous
I'm not sure you needed to find that after all... but good practice with the pythagorean theorem :) The formula for surface area of a cone needs the diagonal length, not the height. The formula I found online (yay Internet!) was: pi * r^2 + pi * r * s where "r" is the radius (shown as 6) and "s" is the diagonal length of the cone's edge, (shown as 15).
anonymous
  • anonymous
http://0.tqn.com/d/math/1/0/t/L/conerr.jpg
anonymous
  • anonymous
woot woot ! got my answer (: 395.84 ft^2 (: (: (:
anonymous
  • anonymous
Good work... you just needed to use the formula.
anonymous
  • anonymous
thank you so much for helping me out (:
anonymous
  • anonymous
Glad to help :)

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