hlambach
  • hlambach
Find the surface area of the cone in terms of π. Rest in comments.
Mathematics
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SOLVED
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katieb
  • katieb
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hlambach
  • hlambach
A. 112 π cm B. 128 cm C. 256π cm D 160π cm
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hlambach
  • hlambach
Now I am not getting that answer: Surface Area (SA) = Lateral Area (LA) + area of base (B) LA - 1/2 x 2πr x l LA = 1/2 x 2π x 3 x 17 LA = 51π B = πr^2 B = π x 3^2 B = 28.27433388 SA = (51π) + 28.27433388 SA = 79.27433388π
Jim766
  • Jim766
SA = pi*r*s + pi * r^2

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More answers

hlambach
  • hlambach
well, that sure makes a difference... haha
Jim766
  • Jim766
SA = 3*17 pi + 3^2pi
hlambach
  • hlambach
ah okay... btw, to make the pi sign, press Alt 227 on your number pad :)
Jim766
  • Jim766
π cool
hlambach
  • hlambach
OKay, how do i add the two pis? do?
hlambach
  • hlambach
whoops, the do? wasnt supposed to be there :)
Jim766
  • Jim766
think of the π as a variable
hlambach
  • hlambach
so π^2? how would i get rid of the ^2?
Jim766
  • Jim766
51π + 9π = 60π
Jim766
  • Jim766
just square the 3 not the π
hlambach
  • hlambach
ahhhh, okay got it! Thanks!
Jim766
  • Jim766
yw
Jim766
  • Jim766
of course not one of your answer choices...
Jim766
  • Jim766
again...
hlambach
  • hlambach
SA = 3*17 pi + 3^2pi SA = 3 x 17π + 9π SA = 60π
hlambach
  • hlambach
?
hlambach
  • hlambach
haha, ikr! my teacher is... yeah, just no... haha :)
Jim766
  • Jim766
its all good.... lol
hlambach
  • hlambach
:) so,just to make sure, SA= 60π, right?
Jim766
  • Jim766
yes
hlambach
  • hlambach
Sweet, okay thanks for all your help, another question is about to come up, though, haha
Jim766
  • Jim766
lol

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