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alainabbyboo22
Group Title
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 ?
 2 years ago
 2 years ago
alainabbyboo22 Group Title
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 ?
 2 years ago
 2 years ago

This Question is Closed

alainabbyboo22 Group TitleBest ResponseYou've already chosen the best response.0
@gaara438125
 2 years ago

gaara438125 Group TitleBest 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?
 2 years ago

alainabbyboo22 Group TitleBest ResponseYou've already chosen the best response.0
this is a completely different question than before . lol . i'm so unsure with this one .
 2 years ago

gaara438125 Group TitleBest 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
 2 years ago

alainabbyboo22 Group TitleBest 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 .
 2 years ago

alainabbyboo22 Group TitleBest ResponseYou've already chosen the best response.0
@gaara438125 @JakeV8 @Grim0519
 2 years ago

JakeV8 Group TitleBest 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.
 2 years ago

mayankdevnani Group TitleBest ResponseYou've already chosen the best response.0
do you know the surface area of cone=?
 2 years ago

JakeV8 Group TitleBest 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...
 2 years ago

mayankdevnani Group TitleBest ResponseYou've already chosen the best response.0
you are right @JakeV8
 2 years ago

alainabbyboo22 Group TitleBest ResponseYou've already chosen the best response.0
the square root of 189 is : 13.7477270849
 2 years ago

JakeV8 Group TitleBest 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).
 2 years ago

JakeV8 Group TitleBest ResponseYou've already chosen the best response.1
http://0.tqn.com/d/math/1/0/t/L/conerr.jpg
 2 years ago

alainabbyboo22 Group TitleBest ResponseYou've already chosen the best response.0
woot woot ! got my answer (: 395.84 ft^2 (: (: (:
 2 years ago

JakeV8 Group TitleBest ResponseYou've already chosen the best response.1
Good work... you just needed to use the formula.
 2 years ago

alainabbyboo22 Group TitleBest ResponseYou've already chosen the best response.0
thank you so much for helping me out (:
 2 years ago

JakeV8 Group TitleBest ResponseYou've already chosen the best response.1
Glad to help :)
 2 years ago
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