✓ Lesson Check

Do you know HOW?

Write each ratio.

1. sin A sine eh
2. cos A cosine eh
3. tan A tangent eh
4. sin B sine b
5. cos B cosine b
6. tan B tangent b

What is the value of x? Round to the nearest tenth.

Do you UNDERSTAND?

9. Vocabulary Some people use SOH-CAH-TOA to remember the trigonometric ratios for sine, cosine, and tangent. Why do you think that word might help? (Hint: Think of the first letters of the ratios.)

10. Error Analysis A student states that sin A > sin X sine , eh greater than sine x because the lengths of the sides of Δ A B C cap delta eh b c are greater than the lengths of the sides of Δ X Y Z . cap delta x y z , . What is the student's error? Explain.