# Parallel and perpendicular lines review

Review the basics of parallel and perpendicular lines.  Identify and draw parallel and perpendicular lines in some practice problems.

## What are $\greenD{\text{perpendicular lines}}$start color greenD, p, e, r, p, e, n, d, i, c, u, l, a, r, space, l, i, n, e, s, end color greenD and $\purpleD{\text{parallel lines}}$start color purpleD, p, a, r, a, l, l, e, l, space, l, i, n, e, s, end color purpleD?

start color greenD, P, e, r, p, e, n, d, i, c, u, l, a, r, space, l, i, n, e, s, end color greenD are lines that meet at right angles.
start color purpleD, P, a, r, a, l, l, e, l, space, l, i, n, e, s, end color purpleD are always the same distance apart from each other — no matter how far they are extended, they will never meet.
Want to learn more about parallel and perpendicular lines? Check out this video.

## Practice set 1: Identify parallel and perpendicular lines

Problem 1A
Which of the following pairs of sides in triangle, G, A, Z are perpendicular?