In the diagram, m∠eca = 120. m∠bcd = a: 120 b: 90 c: 60 d: 180 what is the answer?

I believe it is A) 120, since they are vertical angles.

Vertical angles are alway equal to each other.

Step-by-step explanation:

From the graph, and are two linear function or straight line.

They intersect at .

So point is the solution to the system of linear equations.

Solution or point of intersection must satisfies the equations.

In both the case,

and

Therefore, option 1 is the correct answer.