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I Need Help On this one

I Need Help On this one-example-1
User Dudego
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Your answer is 49. The sum of the interior angles of a four sided polygon is 360 degrees. Using the information that they give you, you can solve for the missing angle.

90 degrees 360 degrees
90 dgrees 311 degrees
131 degrees -___________
+___________ 49 degrees
311 degrees
User Rexxars
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