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by cyclic quadrilateral theorem
the sum of opposite angles of cyclic quadrilateral is 180
angle r and angle n are opposite angles
R + N = 180
5x -13 + 4x + 4= 180
9x = 180 + 13 -4
9x = 171
x = 171/9
x = 19
angle R = 5x -13 = 5x19 -13= 95-13 = 82
angle N = 4x-4 = 19x4 +4 = 80
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