That will depend on what x represents which has not been given.
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First find the number of sides of the polygon and let it be x: Rearrange the diagonal formula: 0.5*(x2-3x) = 135 into a quadratic equation Which is: x2-3x-270 = 0 and solving the equation gives x positive value of 18 Therefore the polygon has 18 sides Sum of interior angles: (18-2)*180 = 2880 degrees Each interior angle: 2880/18 = 160 degrees
There are 5 sides (a pentagon). The perimeter is the length of one side times the number of sides. x * 2.5 = 12.5 and x is 5
.75/x=.33
42
The answer will depend on what x is.