anonymous
  • anonymous
WILL MEDAL AND FAN
Mathematics
  • Stacey Warren - Expert brainly.com
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katieb
  • katieb
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anonymous
  • anonymous
http://prntscr.com/7fb5c4 <-- Prism
anonymous
  • anonymous
Ok, so surface area is literally just the total area of all of the surfaces. You can use the formula \[\large (base *2)+(perimeter*height)\] The base is the base area, the perimeter is the perimeter of the base, and the height is the size of the side adjacent to the base.
anonymous
  • anonymous
Note: The base that you use in surface area formulas is going to be the side that appears on two sides. In this case, the base is the triangle.

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anonymous
  • anonymous
Hello? Are you there? @MalhotraChandra
anonymous
  • anonymous
Sorry I'm here now
anonymous
  • anonymous
So the surface area is 58.49?
anonymous
  • anonymous
Can you tell me how you got that?
anonymous
  • anonymous
I added them up
anonymous
  • anonymous
Well what did you get for the base?
anonymous
  • anonymous
18??
anonymous
  • anonymous
Oh wait no 27
anonymous
  • anonymous
I'm so confused
anonymous
  • anonymous
Well the formula for the area of a triangle is \[\large A=\frac{1}{2}*height*base\] For this triangle is the height is 3 and the base is 9.|dw:1433942233346:dw|
anonymous
  • anonymous
So 13.5?
anonymous
  • anonymous
Right. Now put 13.5 in as the "base" in the surface area formula. \[\huge 2*base=?\]
anonymous
  • anonymous
27!
anonymous
  • anonymous
I could've gotten that by multiplying 9 and 3 though right? Or do I have to use the formula?
anonymous
  • anonymous
Right. So that's the first half of the formula done. Now we have to figure out the perimeter and the height. Can you find the perimeter of the triangle?
anonymous
  • anonymous
9.49?
anonymous
  • anonymous
And that was because we were multiply the triangle area formula by 2 which will look like \[\large 2*\frac{1}{2}*3*9\] Yes, the 2 and 1/2 are going to cancel out.
anonymous
  • anonymous
|dw:1433942566392:dw| Add the sides together so \[\large 3+9+9.49=~?\]
anonymous
  • anonymous
Give me asecond to grab a piece of paper this is too confusing
anonymous
  • anonymous
What about the 37? That doesn't get added in?
anonymous
  • anonymous
That is going to be the "height" in the formula.
anonymous
  • anonymous
21.49
anonymous
  • anonymous
Ok, so now, we're gonna multiply the perimeter (21.49) and the height (37). So \[\large 21.49*37=~?\]
anonymous
  • anonymous
795.13
anonymous
  • anonymous
Ok. That right there is going to be your lateral area. So 795 is the later area. To get the surface area, add on the bases. So \[\large (27)+(795)=~?\]
anonymous
  • anonymous
822
anonymous
  • anonymous
So that's it??
anonymous
  • anonymous
Ok. So now you have your answers \[\huge LA=795\\\huge SA=822\]
anonymous
  • anonymous
And yeah, that would be it.
anonymous
  • anonymous
Wow ok that made a whole lot more sense than when my teacher explained it... It's still hard and confusing but I think that could change with a bit of practice.. Thank you very very much for your time!!
anonymous
  • anonymous
\[\huge \color{aqua}N\color{fuchsia}o \space \color{lime}P \color{orange}r \color{blue}o \color{maroon}b \color{red}l \color{olive}e \color{purple}m \color{gray}: \color{black})\]

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