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Ok heres the other one...

Ok heres the other one...-example-1
User Rwkiii
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1 Answer

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Explanation:

Think of every surface as a 2D shape.

you know that

Area of a triangle is: A = 0.5 b h

Area of a square is: A = L x W

You add each area thats exposed

for example: the front and back of the triangle would be (0.5 x 3cm x 8cm) x 2 [since there are two faces]

User Areum
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