Labeling Right Triangle Sides
Grade 9th Grade · Math · 45 min
What's Included
Learning Objective
I can label the sides of a right triangle as opposite, adjacent, and hypotenuse, relative to a given angle.
Warm-Up Video
Kayla Jones · 6:59
SOH CAH TOA
Guided Notes
3 key concepts
- 1
In a right triangle, the hypotenuse is always across from the right angle, and the other sides are named relative to a specific angle, θ (theta).
- 2
The side across from angle θ is called the opposite side, while the side next to θ is the adjacent side.
- 3
SOH CAH TOA is an acronym that defines the trigonometric ratios: Sine = Opposite/Hypotenuse, Cosine = Adjacent/Hypotenuse, Tangent = Opposite/Adjacent.
Practice Questions
9 questions · Multiple choice & Short answer
Exit Ticket
Quick comprehension check
“In a right triangle, angle θ is one of the acute angles. Side AC is across from angle θ, and side BC is next to angle θ. Side AB is across from the right angle. Label each side (AC, BC, and AB) as either opposite, adjacent, or hypotenuse relative to angle θ.”
Complete Lesson Package
Get all 3 ready-to-use resources:
