9.6 Sine and Cosine

CHIEF SOH-CAH-TOA

SOH CAH TOA

Geogebra Investigation 1)Open up the tangent.ggb file on scevmath.org. 2)Use the length tool to find the lengths of the hypotenuse’s, opposite legs and adjacent legs of each of the right triangles. 3)Find the sin 30 and cos 30.

Find the length of x

Guided Practice Draw a and triangle. 1)Find: sin 30, sin 45, sin 60, cos 30, cos 45, cos 60 2) What is the relationship between: sin 30 and cos 60 sin 45 and cos 45 sin 60 and cos and 60 degree angles

Guided Practice Rewrite sin in terms of cos. sin 11sin 80sin 0sin 100 Rewrite cos in terms of sin. cos xcos 27cos -5cos 64

Angle of Depression The angle formed by a horizontal line and a sight line going downward.

Angle of Elevation The angle formed by a horizontal line and a sight line going upward.

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