8.3 - Trigonometry

​To use the sine, cosine, and tangent ratios to determine side lengths and angle measures in right triangles.

​The study of triangle measure

​(Take about 2 minutes)

​I mean, fun to do at parties, but...

What can we do with it?

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In this triangle we know one angle measure (two if we count the right angle) and one side length.

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Using the trigonometric ratios, we can find the other side lengths. (And we'll find out next time we can find a missing angle too.​

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​Open your calculator and turn it landscape to open the scientific calculator.

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Be sure you see "Rad" on the button in the lower left hand corner. Find the keys that say "sin", "cos", and "tan".

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We know something about the side opposite the 28 degree angle (it's labeled x) and we know the hypotenuse (19). So which trig ratio uses opposite and hypotenuse?

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​What'd you get?