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# Geo_4.3

### Vocabulary for Geometry_4.3

TermDefinition
angle of depression The angle between the line of sight and the horizontal when an observer looks downward.
angle of elevation The angle between the line of sight and the horizontal when an observer looks upward.
cosine For an acute angle of a right triangle, the ratio of the measure of the leg adjacent to the acute angle to the measure of the hypotenuse.
sine For an acute angle of a right triangle, the ratio of the measure of the leg opposite the acute angle to the measure of the hypotenuse.
tangent For an acute angle of a right triangle, the ratio of the measure of the leg opposite the acute angle to the measure of the leg adjacent to the acute angle.
inverse cosine The inverse function of cosine, or cos-1. If the cosine of an acute ∠A is equal to x, then cos^(-1)⁡x is equal to the measurement of ∠A.
inverse sine The inverse function of sine, or sin-1. If the sine of an acute ∠A is equal to x, then sin^(-1)⁡x is equal to the measurement of ∠A.
inverse tangent The inverse function of tangent, or tan-1. If the tangent of an acute ∠A is equal to x, then tan^(-1)⁡x is equal to the measurement of ∠A.
trigonometric ratio A ratio of the lengths of sides of a right triangle.
trigonometry The study of the properties of triangles and trigonometric functions and their applications.