Most people think of perpendicular lines as the opposite of parallel.
Answer
The two perpendicular lines are PQ (also PO or OQ) and KR (also KO or OR) because they form a right angle (∠KOQ).
Example 3
Is ∠LOQ an obtuse, right, or acute angle? How do you know?
Hint
What defines an obtuse, right, or acute angle?
Answer
Obtuse angles are angles with measurements greater than 90°. We know ∠LOQ is an obtuse angle because it contains within it ∠KOQ, which is already a right angle.
Example 4
What is the measurement of ∠POR?
Hint
Think "vertical angles," yo.
Answer
m∠POR = 90°
Example 5
Is ∠LOK an obtuse, right, or acute angle?
Hint
Compare it to that right angle nearby. Is it bigger, smaller, or the same?
Answer
Boom: ∠LOK is an acute angle because it's less than 90°.
