Answer:
Angle ADB = 80 degrees
Explanation:
This is a parallelogram so:
AD || BC
AB || DC
Using the Alternate Interior Angles Postulate, you can find that:
Angle BDC = Angle DBA
So because Angle BDC is 28 degrees, we know that Angle DBA is also 28 degrees.
Now, we can figure out what angle ADB is using the property of triangles that all the angles of add up to 180:
Angle ADB + 72 + 28 = 180
Angle ADB + 100 = 180
Angle ADB = 80
So, Angle ADB is 80 degrees.