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Lesson 7.7

Lesson 7.7. Goal: The students will use inverse sine, cosine and tangent ratios.m. Inverse Trigonometry Ratios. B. a c. C b A. These find the angle measure, not the ratio. How to use the calculator.

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Lesson 7.7

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  1. Lesson 7.7 Goal: The students will use inverse sine, cosine and tangent ratios.m

  2. Inverse Trigonometry Ratios B a c C b A These find the angle measure, not the ratio.

  3. How to use the calculator Press the 2nd button to access inverse sine, cosine and tangent. tan A = .5698 Find A. cos A = .3921 Find A. sin A = .9067 Find A.

  4. Find the angle measure. • Decide which trigonometric ration to use. • Set up equation. • Go ahead and solve. Find angle A.

  5. sinA = 0.87 cosB = 0.15 a. b. Let Aand Bbe acute angles in a right triangle. Use a calculator to approximate the measures of Aand Bto the nearest tenth of a degree.

  6. Solve a Right Triangle B 42˚ 12 C A This means find any missing angle measure and side length.

  7. Solve the Right Triangle

  8. Suppose your school is building a raked stage. The stage will be 30 feet long from front to back, with a total rise of 2 feet. A rake (angle of elevation) of 5o or less is generally preferred for the safety and comfort of the actors. Is the raked stage you are building within the range suggested?

  9. Assignment P. 485 # 1, 3,6,7, 10-12, 19, 20, 21-23, 25

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