Calculate the surface area of this triangular prism.

Question

anonymous · Answer

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puzzler7 · Answer

The total surface area is the 2 triangular faces plus the lateral surface area. The lateral surface area is the perimeter of the triangle times the height. So we get:$$2*(9*12/2) + (9+12+15)*10 = Surface Area$$

akashdeepdeb · Answer

What is 'surface area'?
It is the sum of the areas of all the surfaces which are on the outer part of the solid/hollow object.

Here is cool fact about the triangular prism:
There are 2 faces opposite to each other, which are the same.

You can thus, calculate the area of the top and bottom surface by calculating the area of the triangle and multiplying it by 2!

You can also calculate the area of the three lateral surfaces as they are simply just three rectangles with a width and a length.

Are you getting this?

anonymous · Answer

omg, the way akash does it is so easy! 
shamefully put my work here.