Parallel and Perpendicular Lines - Maths First

Perpendicular Lines Theorem If two lines intersect to form a linear pair of congruent angles, then the lines are perpendicular line Proof:

Two lines are perpendicular when they intersect to form a 90 ∘ angle Below, l ⊥ A B ¯

perpendicular Two line segments or rays that are connected at one endpoint are perpendicular if and only if the angle they create measures 90° For example, the two lines of

perpendicular Two lines that form a T are perpendicular to each other They meet at a right angle A person who is standing is perpendicular to the earth