Asked by sara

Is there a way to post a pic to help explain this?
(I will try and explain the triangular prism. it has a 90 angle. the long end of the triangle is 13.5 in. One side is 10 in and the other side of the triangle is 9 in. the side coming down from the triangle making the prisms length is 9 in.

I need help with this problem.
It asks what is the surface area of the prism?
The formula I used was
SA=W(A)+L(W)+L(H)+L(S)
SA=9(10)+9(9)+9(10)+9(13.5)
SA=90+81+90+121.50
SA=382.5 in^2

I asked two of my friends to help and we all had different answers, so I would appreciate any help. I hope you can see the pic or else maybe you can even tell me if the formula I used was correct.
Thank you so much for your help


Answered by Sara
IMG_7042.JPG
I tried to take a pic of the image.
Hope it shows because I really need help. Thank you
Answered by Steve
The area of the triangular base is (1/2)(9)(10) = 45

There are two of those, for a total of 90

There are three rectangular faces of area 9*10+9*9+9*13.5, for a total of 292.5

Total area is thus 90+292.5 = 382.5 in^2
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