40 degrees ( 180 - 140 = 40 )
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The supplement of an angle is the angle that, when added to the given angle, equals 180 degrees. Therefore, to find the supplement of a 140-degree angle, you subtract 140 from 180. The measure of the supplement of a 140-degree angle is 40 degrees.
Angle is x degrees. Then 2(180 - x) = 5(90 - x) + 30 360 - 2x = 450 - 5x + 30 3x = 120 x = 40 Check: supplement is 140, 2 x 140 = 280 complement is 50, 5 x 50 = 250 difference is 30 as required. QED
140
Since the interior angle measure of the regular polygon is 140⁰, its exterior angle measure is 180⁰ - 140⁰ = 40⁰. Since the sum of the exterior angle measures is 360⁰, the polygon has 360⁰/40⁰ = 9 sides.
140
You would subtract 40 degrees from 180 degrees so it would look like this:180 degrees - 40 degrees = 140 degrees