In a parallelogram ABCD angle B = 3x+ 10 angle D = 2x+15. find angle c
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Since sum of adjacent angles of a parallelogram is equal to 180°.
If ABCD is a parallelogram,
Angle A + Angle B = 180°
=) 2x + 15° + 3x - 25° = 180°
=) 5x - 10° = 180°
=) 5x = 180° + 10°
=) 5x = 190°
=) x = 190°/5
=) x = 38°.
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