The measure of an angle is 72 degrees what is the measure of its conplementary angle

In triangle abc segment de is parallel to the side ac . (the endpoints of segment de lie on the sides ab and bc respectively). find de, if ac=20cm, ab=17cm, and bd=11.9cm;

Find the value of tan theta if sin theta = 12/13 and theta is in quadrant 2

Iwill give ! if m∠a=59 and m∠3=81°, what is m∠b? m∠b= _[blank]_°