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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 ?
 one year ago
 one year ago
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 ?
 one year ago
 one year ago

This Question is Closed

gaara438125Best ResponseYou've already chosen the best response.0
we need to find the height first, which i believe we already found was 16.16 correct?
 one year ago

alainabbyboo22Best ResponseYou've already chosen the best response.0
this is a completely different question than before . lol . i'm so unsure with this one .
 one year ago

gaara438125Best ResponseYou've already chosen the best response.0
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
 one year ago

alainabbyboo22Best ResponseYou've already chosen the best response.0
my answer was 189 . what do i do from there ? because that answer isn't available in the answer choices .
 one year ago

alainabbyboo22Best ResponseYou've already chosen the best response.0
@gaara438125 @JakeV8 @Grim0519
 one year ago

JakeV8Best ResponseYou've already chosen the best response.1
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.
 one year ago

mayankdevnaniBest ResponseYou've already chosen the best response.0
do you know the surface area of cone=?
 one year ago

JakeV8Best ResponseYou've already chosen the best response.1
But then, yeah, you need surface area, not just the length of the outside edge. I don't have that formula handy...
 one year ago

mayankdevnaniBest ResponseYou've already chosen the best response.0
you are right @JakeV8
 one year ago

alainabbyboo22Best ResponseYou've already chosen the best response.0
the square root of 189 is : 13.7477270849
 one year ago

JakeV8Best ResponseYou've already chosen the best response.1
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).
 one year ago

JakeV8Best ResponseYou've already chosen the best response.1
http://0.tqn.com/d/math/1/0/t/L/conerr.jpg
 one year ago

alainabbyboo22Best ResponseYou've already chosen the best response.0
woot woot ! got my answer (: 395.84 ft^2 (: (: (:
 one year ago

JakeV8Best ResponseYou've already chosen the best response.1
Good work... you just needed to use the formula.
 one year ago

alainabbyboo22Best ResponseYou've already chosen the best response.0
thank you so much for helping me out (:
 one year ago
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