Draw a line segment AB of 4 cm in length. Draw a line perpendicular to AB through A and B, respectively. Are these lines parallel?

Question

Philoid · Accepted Answer

We know that if two lines are parallel, then the angle between them will be 0° or 180°.

Here, ∠XAB = 90°

And ∠YBA = 90°

∴ ∠XAB + ∠YBA = 90° + 90°

= 180°

So, the lines XA and YB are parallel.