You need to know the Length, Width and Height of the cuboid.
Then surface area = 2*(L*W + W*H + H*L) square units.
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to find the surface area you have to first find the area of each part then add the areas together.
No, a cubiod is not a polyhedron but a cuboid is.
to find the surface area of the triangle we just need to multiply the length with breath. area=lengthXbreadth
You will need to find the surface area of each face and add them together.
You find the surface area of each of its six faces and add them together.