The angles of a quadrilateral are 6x + 18º,7x -20°, 5x + 10º and 4x. Find their measures.
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X = 16 this is the answer now you can measure the angle
6x + 18 = 6×16+18 =114
7x-20 = 7×16-20 = 92
5x + 10 = 5×16+10 = 90
4x = 4×16 = 64
114+92+90+64=360
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