There no such thing as perimeter of 3D objects . Generally perimeter is for 2D objects but you can find the surface are of a cube if you wished to ask that. Surface area of cube is - 6 x side x side.
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The perimeter of a cube is simply the perimeter of one side of the cube.
The volume of the cube is: 125 cubic cm
If you know the perimeter, there is no need to find it again.
Find the cube root of 2744.
There is no reason for the perimeter of a triangle to have any relation to the perimeter of an unrelated rectangle!