Question

Find the value of $\angle 1$ (in degrees).
Given, l and m are two parallel lines.

• A. 100
• B. 120
• C. 105
• D. Can’t say

Answer 1

The correct option is C

105

It can be concluded from the figure that line l is parallel to line m because a pair of corresponding angles (${100}^{\circ }$) are equal.
Since the lines l and m are parallel, $\angle 1$ = ${105}^0$ (Alternate interior angles).