ABCD is a rectangle with AC =10 cm and BC=8cm. Diagonals AC and BD intersect at E and D2=20°. Calculate the sizes of all interior angles and AD,AE and AB? So can I say D1+D2=90° and what's the reason?

ABCD is a rectangle with AC =10 cm and BC=8cm. Diagonals AC and BD intersect at E and D2=20°. Calculate the sizes of all interior angles and AD,AE and AB? So can I say D1+D2=90° and what's the reason?