Solving Right Triangles with Trig Ratios
Grade 9th Grade · Math · 40 min
What's Included
Learning Objective
I can solve the unknown side of right angles triangles using trigonometric ratios
Warm-Up Video
YourMathGal · 10:16
Solve Right Triangles 1
Guided Notes
3 key concepts
- 1
Solving a right triangle means stating the measures of the three angles and the lengths of the three sides.
- 2
If angle A is 40° and angle C is 90°, then angle B must be 50 degrees because angles A and B must add up to 90°.
- 3
To solve for an unknown side, you can set up an equation using sine, cosine, or tangent, but you must know at least one side of the right triangle.
Practice Questions
5 questions · Multiple choice & Short answer
Exit Ticket
Quick comprehension check
“In a right triangle, angle A is 35° and the side opposite to it (side a) is 15 units long. Find the length of the hypotenuse (side c). Round your answer to the nearest tenth.”
Complete Lesson Package
Get all 3 ready-to-use resources:
