Question

I will mark brainlest answer for the first correct answer​

Answer 1

Answer:

The answer will be 80.

Step-by-step explanation:

For your understanding, extend the line BC to some point, say E. Now, angle DCE = angle ABC since AB parallel DC.

Now, angle DCE + angle DCB = 180 (linear property)

100 + angle C = 180

angle C = 80 degrees.

That's all.