ABCD is a parallelogram with angle a : angle b = 3 : 2.<br>In a parallelogram, adjacent angles sum to 180 degrees.<br>Let the parts be 3 units and 2 units. Total = 5 units = 180, so 1 unit = 36 degrees.<br>Angle a = 3 x 36 = 108 degrees.<br><br>Final Answer: 108