In the figure (1) given below, ABCD is a parallelogram in which ∠DAB = 70°, ∠DBC = 80°. Calculate angles CDB and ADB.

In figure (2) given below, ABCD is a parallelogram. Find the values of x and y.

In figure (2) given below, ABCD is a parallelogram. Find the angles of △AOD.

In figure (1) given below, ABCD is a parallelogram with perimeter 40. Find the values of x and y.