SOLUTION: three angles of a quadrilateral are 81 degrees,105 egrees,and 138 degrees.find the measure of the fourth angle.

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Question 1132537: three angles of a quadrilateral are 81 degrees,105 egrees,and 138 degrees.find the measure of the fourth angle.
Answer by ikleyn(52787) About Me  (Show Source):
You can put this solution on YOUR website!
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It is  360° - (81° + 105° + 138°),


because the sum of four interior angles of any (convex) quadrilateral is equal to 360°.

Solved.

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