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Trigonometry: Introduction to Ratios — Notes
Guided Notes
Name:
Date:
Period:
Directions: Fill in each blank as we work through the problems together. Use the diagrams to guide your thinking.
G.9(A) — Right Triangles & Trigonometry
1
Identify the ratio for cos(θ) given the right triangle.
Step 1.Identify the definition of cos: Numerator Denominator
Step 2.Substitute the known values based on angle θ: Value
2
Identify the ratio for sin(θ) given the right triangle.
Step 1.Identify the definition of sin: Numerator Denominator
Step 2.Substitute the known values based on angle θ: Value
3
Identify the ratio for tan(θ) given the right triangle.
Step 1.Identify the definition of tan: Numerator Denominator
Step 2.Substitute the known values based on angle θ: Value
TEKSG.9(A)
Euclid Engine—October 11, 2026