anonymous
  • anonymous
I need some help with Geometry, Finding Total Area in Prisms.
Mathematics
  • Stacey Warren - Expert brainly.com
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SOLVED
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katieb
  • katieb
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anonymous
  • anonymous
Si, si
anonymous
  • anonymous
What is the question?
anonymous
  • anonymous
Find the Total Area of the Prism:

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anonymous
  • anonymous
1 Attachment
anonymous
  • anonymous
@johnsonshelby
anonymous
  • anonymous
Find the area of each side and add together... that's surface area I'm having a brain fart haha What is it you want to find?
anonymous
  • anonymous
Thats gross.
anonymous
  • anonymous
I want to find total Area
anonymous
  • anonymous
T.A. = ph + 2B
anonymous
  • anonymous
Rho as in density, right?
anonymous
  • anonymous
Rho?
anonymous
  • anonymous
Greek letter p
anonymous
  • anonymous
perimeter of the base times height of the prism + 2Base = Total Area
anonymous
  • anonymous
Well the 2B part is easy. 2(area of the triangles)
anonymous
  • anonymous
Area of Triangle : 1/2 times 9 "correct" ?
anonymous
  • anonymous
1/2 time base of the triangle times the height of the triangle. Because you are only given the base, you need to find the height.
anonymous
  • anonymous
And to find the height we use pythag theorem correct?
anonymous
  • anonymous
So your new base would be 1.5 and the hypo would still be 3, yep
anonymous
  • anonymous
So the height would be a^2?
anonymous
  • anonymous
c= 3, b=1.5, and yep a= a
anonymous
  • anonymous
so when you plug into pythag, you would get that
anonymous
  • anonymous
So A= √6.75 ?
anonymous
  • anonymous
Yeah!
anonymous
  • anonymous
I have to get to my orgo class in 10 minutes, can you take it from here?
anonymous
  • anonymous
So i find the area of the triangle and multiply it by 2 Then i add ?
anonymous
  • anonymous
add that to the (perimeter of the base x height), which would be (3+3+3)(6)
anonymous
  • anonymous
Area of Triangle = 1.5√6.75 correct?
phi
  • phi
btw, people would write \[\sqrt{6.75} \] as \[ \frac{3 \sqrt{3}}{2}\]
anonymous
  • anonymous
Okay i got it. Thanks so much!! I just needed a refresh it's been awhile :)
anonymous
  • anonymous
So it would be 4.5√3 / 2 @phi ?
phi
  • phi
generally you don't mix decimals and fractions i.e. 4.5/2 If you have a multiple choice you probably would see the answer as a pure fraction \[ \frac{4}{9}\sqrt{3} \]
phi
  • phi
double that for the other triangle now you have 3 faces that all look the same size 3x6 3 faces each 18 = 54 plus the two triangles 8/9 sqrt(3)
anonymous
  • anonymous
Other triangle?
phi
  • phi
you have two triangles (the ends) and 3 "side faces" right?
anonymous
  • anonymous
Yeah my bad, sorry

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