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# NorthCrawford GeoCh8

### Right Triangles and Trigonometry

TermDefinition
Angle of Depression The angle formed by a horizontal line and the line of sight to an object below the horizontal line.
Angle of Elevation The angle formed by a horizontal line and the line of sight to an object above the horizontal line.
Cosine Length of leg adjacent to angle A b --------------------------------- = - Length of hypotenuse c
Law of Cosines a^2 = b^2 + c^2 - 2bc cos A b^2 = a^2 + c^2 - 2ac cos B c^2 = a^2 + b^2 - 2ab cos C
Law of Sines sin A sin B sin C ----- = ----- = ----- a b c
Pythagorean Triple A set of nonzero whole numbers.
Sine Length of leg opposite angle A a ----------------------- = - Length of hypotenuse c
Tangent Length of leg opposite angle A a --------------------------------- = - Length of leg adjacent to angle A b
Trigonometric Ratios Similar right triangles have equivalent ratios for their corresponding sides.
Created by: mbuening