You need to give more information... you're probably going to use a trig identity though.
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105 degrees
50 degrees if its a triangle
In a parallelogram adjacent angles are supplementary, so angles are 75 degrees (A & C) and 105 degrees (B & D).
The angles are supplementary if they have a sum of 180 degrees.
It is a right angle triangle and angle A measures 15 degrees.