## anonymous one year ago WILL MEDAL AND FAN

1. anonymous

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

2. 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.

3. 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.

4. anonymous

Hello? Are you there? @MalhotraChandra

5. anonymous

Sorry I'm here now

6. anonymous

So the surface area is 58.49?

7. anonymous

Can you tell me how you got that?

8. anonymous

9. anonymous

Well what did you get for the base?

10. anonymous

18??

11. anonymous

Oh wait no 27

12. anonymous

I'm so confused

13. 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|

14. anonymous

So 13.5?

15. anonymous

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

16. anonymous

27!

17. anonymous

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

18. 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?

19. anonymous

9.49?

20. 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.

21. anonymous

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

22. anonymous

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

23. anonymous

24. anonymous

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

25. anonymous

21.49

26. anonymous

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

27. anonymous

795.13

28. 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 $\large (27)+(795)=~?$

29. anonymous

822

30. anonymous

So that's it??

31. anonymous

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

32. anonymous

And yeah, that would be it.

33. 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!!

34. anonymous

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