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 S INE (S IN ): Opposite Leg/Hypotenuse  C OSINE (C OS ): Adjacent Leg/Hypotenuse  Example: Find sin A, cos A, sin B, and cos B › sin A = opposite.

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Presentation on theme: " S INE (S IN ): Opposite Leg/Hypotenuse  C OSINE (C OS ): Adjacent Leg/Hypotenuse  Example: Find sin A, cos A, sin B, and cos B › sin A = opposite."— Presentation transcript:

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2  S INE (S IN ): Opposite Leg/Hypotenuse  C OSINE (C OS ): Adjacent Leg/Hypotenuse  Example: Find sin A, cos A, sin B, and cos B › sin A = opposite / hypotenuse = 4 / 5 › cos A = adjacent / hypotenuse = 3 / 5 › sin B = opposite / hypotenuse = 3 / 5 › cos B = adjacent / hypotenuse = 4 / 5

3  Your Turn › Find each value › sin P › sin R › cos P › cos R 12 / 13 5 / 13 5 / 13 12 / 13

4  A ski run 8395 feet long has a 20˚ angle of elevation. What is the vertical drop from the top of the run? › Looking for the angle opposite 20˚ › Given the hypotenuse  Use the sin function › sin 20 = x/8395 › 8395  sin 20 = x › 2871.3 ft = x

5  You can use the sin -1 and cos -1 buttons on your calculator to find the measure of unknown angles, like we did yesterday with the tan -1 button.  Example: Find the measure of H to the nearest degree. › We have the adjacent side (8) › We have the hypotenuse (9) › Use the cosine function › cos x = 8 / 9 › cos -1 ( 8 / 9 ) = x › 27˚ = x

6 YYOUR TURN ›F›Find the measure of  R to the nearest degree ›7›71˚

7  Assignment › Worksheet #13-5  ThursdayChapter 13 Preview  FridayChapter 13 Review  Next MondayChapter 13 Test  Next TuesdayQuarterly Preview  Next Wed/ThurQuarterly Review  Next Friday3 rd Quarterly Exam


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