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 ?
Stacey Warren - Expert brainly.com
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this is a completely different question than before . lol . i'm so unsure with this one .
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
my answer was 189 . what do i do from there ? because that answer isn't available in the answer choices .
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.
do you know the surface area of cone=?
But then, yeah, you need surface area, not just the length of the outside edge.
I don't have that formula handy...
you are right @JakeV8
the square root of 189 is : 13.7477270849
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).