Question

In the diagram below ab is parallel to cd what is the value of x ?

A; 80
B;100
C;120
D:60

Answer 1

C

Explanation:

Since the lines are parallel then

x and 120 are alternate angles and congruent, hence

x = 120 → C

Answer 2

Option C is correct.

Explanation:

We are given that line
`\overline{AB}` and line
`\overline{CD}` are parallel to each other.

We have to find value of x.

Measure of given angle = 120°

Clearly from pic,

Given angle and x are interior angles and on the alternate sides.

So using a result of parallel line which says that Alternate interior angles are equal.

So, x = 120°

Therefore, Option C is correct.