The following are angles in a convex quadrilateral:

Question

Angle A = 75.3 degrees
Angle B = 114.8 degree
Angle C = 65.9 degrees
What is the measure of the missing angle?

Answer 1

Add the three angles together and subtract from 360.

http://www.geom.uiuc.edu/~dwiggins/conj06.html

Answer 2

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