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6.3 Sine Cosine Tangent Notes FI.notebook 1 January 26, 2016 So far you've learned to use Pythagorean Theorem to find the 3rd side of a right triangle if you know two sides. If you only know one side, and it's a 454590 or 306090 right triangle, we could find the other two sides. But what about all the other right triangles that are not special right triangles?

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Page 1: 6.3 Sine Cosine Tangent Notes F-I.notebookdc-pope.weebly.com/.../7/5/37756673/6.3_sine_cosine_tangent_notes… · 6.3 Sine Cosine Tangent Notes FI.notebook 1 January 26, 2016 So far

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So far you've learned to use Pythagorean Theorem to find the 3rd side of a right triangle if you know two sides. If you only know one side, and it's a 45­45­90 or 30­60­90 right triangle, we could find the other two sides. But what about all the other right triangles that are not special right triangles?

Page 2: 6.3 Sine Cosine Tangent Notes F-I.notebookdc-pope.weebly.com/.../7/5/37756673/6.3_sine_cosine_tangent_notes… · 6.3 Sine Cosine Tangent Notes FI.notebook 1 January 26, 2016 So far

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36o

54o15

We need a new way to find the missing sides of this triangle since it is not a special right triangle and we only know one side. To do this, we will use TRIGONOMETRY!

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