Question

In the diagram, m/ACB = 55°.

E
What is mZECD?
90°
O 55°
180°
D
O 125°
C
B
80

Answer 1

55°

Explanation:

Angle ACB and angle ECD are alternate exterior angles and alternate angles have same angle measurements:

If angle ACB = 55°

then angle ECD is also = 55°