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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

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