Simplest way: Exterior angle = 180 - 135, ie 45. Sum of exterior angles of ANY polygon = 360 so number of sides = 360/45 ie 8
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an Octagon
If the 135-degree polygon is a regular polygon and each interior angle measures 135 degrees then the polygon is an eight-sided octagon
Providing that it is a regular 8 sided octagon then each interior angle is 135 degrees
Each interior angle of the regular 8 sided octagon measures 135 degrees
if it is a polygon then the total interior angles will equal 1080. so ear angle will be 135 degrees.