There is no objective perimeter measurement for a doormat. While some may be similar in size, many will be different.
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perimeter.
fixed perimeter is the perimeter being fixed
There is no reason for the perimeter of a triangle to have any relation to the perimeter of an unrelated rectangle!
Semi-perimeter means half the perimeter. Calculate the perimeter, then divide that by 2 to get the semi-perimeter.
The perimeter of a cube is simply the perimeter of one side of the cube.