how to check the angles of a polygon which has four interior angles more than 180 degrees

i am working on a survey control points,which made a concave polygon which have 4 angles more than 180 degrees. i have to check the sum of interior angles and calculate the coordinates of the points.
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2 Answers

88+5=93
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88+5=93hfrjd ghwfkre,cdxjhfdmjvnchdsjoa02[843-9eiuhwgdsbnmbbbbbbbbbbbbbbbbbhddddddddddddddddddwwwwwwww
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