if you have the area. divide the area by the length to get the width. If you have the perimeter subtract the length twice and divide the number you have by two. If it is a square the width is the same as the length.
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All solid figures have length, width and height and, conversely, if a figure has length, width and height then it is a solid figure.
A plane figure
you have to figure out length times width to get the formula for diagonal length suckers
There seems to be a degree of difficulty about perimeter, which is just the measurement of the outline of the figure. It appears that your figure is a rectangle so the perimeter is merely twice (the sum of length and width, ie 150 units). If length exceeds width by 20 then length is 85 and width is 65.
a two dimensional figure is flat. it only has length and width. three dimensional figures have length, width and height. A square is a 2 dimensional figure, but a cube is a 3 dimensional figure.