if the angles of a quadrilateral are x°, (2x+13)°,(3x+10)°,(x-6),find x
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we know that the sum of all the angle in quadrilateral is 360 so .
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x + 2x + 13+ 3x +10 + x - 6 = 360
7x + 13 +10 -6 = 360
7x + 23 - 6 = 360
7x + 17 = 360
7x= 360 - 17
7x = 343
x = 343/7
=49
therefore x = 49
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