Question

In quadrilateral abcd side ab is parallel to side dc ,if angle a:angle d=1:2 & angle c:angleb=4:5. Calculate each angles of the quadrilateral?

Answer 1

see solution in image .........

Answer 2

Answer:

x + 2n = 180°

3n = 180°

n = 60° = A , B = 120°

5y + 4y = 180°

9y = 180°

y = 20°

a = 80°

b = 100°