You need to find perimeter when you buy a house, because then you know where your yard begins and ends.
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To find the perimeter of the curved section of the semi-circle: Perimeter of semicircle = Pi x radius If you also need to the find the perimeter of the straight part of the semicircle (the diameter), it is simply double the radius.
you need length and width length multiply width = area length + length + width + width = perimeter
Some times you do. If you know all of the side lengths, then you can just add them to find the perimeter, if one of the sides is the same as the height, then you may need to find it.
You need to find the perimeter of one by adding together the lengths of all its sides. The perimeter of the similar shape is the answer multiplied by the similarity ratio.
Length + width = half of perimeter, so you need more information...