Find the angles A, B, and C of the convex quadrilateral ABCD if angle A = angle B = angle C and angle D = 135 degrees.
| December 5, 2020 | education
the sum of the angles of a quadrilateral is 360 degrees
denote the angles a, b and c for x degrees
then 3x + 135 = 360
3x = 225
x = 75
means angles a = b = c = 75 degrees
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