In the given diagram, find the sum of the angles a, b, c and d.
360∘
270∘
180∘
90∘
a+b = 180∘. (angles on a straight line)
c+d = 180∘. (angles on a straight line)
Therefore, a+b+c+d = 360∘.
Find the sum of the angles of the △ABD.
Choose the correct option:
If two angles are supplementary, then their sum is ___________
A. 90°
B. 180°
C. 270°
D. 360°