WILL MEDAL AND FAN

- anonymous

WILL MEDAL AND FAN

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- anonymous

http://prntscr.com/7fb5c4 <-- Prism

- 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

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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## More answers

- anonymous

Hello? Are you there? @MalhotraChandra

- anonymous

Sorry I'm here now

- anonymous

So the surface area is 58.49?

- anonymous

Can you tell me how you got that?

- anonymous

I added them up

- anonymous

Well what did you get for the base?

- anonymous

18??

- anonymous

Oh wait no 27

- anonymous

I'm so confused

- 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

So 13.5?

- anonymous

Right. Now put 13.5 in as the "base" in the surface area formula. \[\huge 2*base=?\]

- anonymous

27!

- anonymous

I could've gotten that by multiplying 9 and 3 though right? Or do I have to use the formula?

- 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

9.49?

- 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

|dw:1433942566392:dw| Add the sides together so \[\large 3+9+9.49=~?\]

- anonymous

Give me asecond to grab a piece of paper this is too confusing

- anonymous

What about the 37? That doesn't get added in?

- anonymous

That is going to be the "height" in the formula.

- anonymous

21.49

- anonymous

Ok, so now, we're gonna multiply the perimeter (21.49) and the height (37). So \[\large 21.49*37=~?\]

- anonymous

795.13

- 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

822

- anonymous

So that's it??

- anonymous

Ok. So now you have your answers \[\huge LA=795\\\huge SA=822\]

- anonymous

And yeah, that would be it.

- 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

\[\huge \color{aqua}N\color{fuchsia}o \space \color{lime}P \color{orange}r \color{blue}o \color{maroon}b \color{red}l \color{olive}e \color{purple}m \color{gray}: \color{black})\]

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