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Contents Lesson 7-1Geometric Mean Lesson 7-2The Pythagorean Theorem and Its Converse Lesson 7-3Special Right Triangles Lesson 7-4Trigonometry Lesson 7-5Angles of Elevation and Depression Lesson 7-6The Law of Sines Lesson 7-7The Law of Cosines

Lesson 4 Contents Example 1Find Sine, Cosine, and Tangent Ratios Example 2Evaluate Expressions Example 3Use Trigonometric Ratios to Find a Length Example 4Use Trigonometric Ratios to Find an Angle Measure

Example 4-1a Find sin L, cos L, tan L, sin N, cos N, and tan N. Express each ratio as a fraction and as a decimal.

Example 4-1b

Example 4-1c

Example 4-1d

Example 4-1e Answer:

Example 4-1f Find sin A, cos A, tan A, sin B, cos B, and tan B. Express each ratio as a fraction and as a decimal.

Example 4-1g Answer:

Example 4-2a Use a calculator to find tan to the nearest ten thousandth. KEYSTROKES: TANENTER Answer:

Example 4-2b KEYSTROKES: 90 0 COSENTER Answer: Use a calculator to find tan to the nearest ten thousandth.

a. Use a calculator to find sin 48° to the nearest ten thousandth. b. Use a calculator to find cos 85° to the nearest ten thousandth. Example 4-2c Answer:

End of Lesson 4

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