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# Chapter 7 - Geo.

### Chapter 7 Vocabulary - Right Triangles and Trigonometry

WordDefinition
angle of depression when you look down at an object, the angle that your line of sight makes with a line drawn horizontally
angle of elevation when you look up at an object, the angle that your line of sight makes with a line drawn horizontally
cosine a trigonometric ratio, abbreviated as cos; for a right triangle ABC, the cosine of the acute angle A is cos A = length of leg adjacent <A over length of hypotenuse = AC over AB
inverse cosine an inverse trigonometric ratio, abbreviated as cos-1; for acute angle A, if cos A = z, then cos-1 = m<A
inverse sine an inverse trigonometric ratio, abbreviated as sin-1; for acute angle A, if sin A = z, then sin-1 = m<A
inverse tangent an inverse trigonometric ratio, abbreviated as tan-1; for acute angle A, if tan A = z, then tan-1= m<A
Pythagorean triple a set of three positive integers a, b, and c that satisfy the equation c squared = a squared + b squared
sine a trigonometric ratio, abbreviated as sin; for a right triangle ABC, the sine of the acute angle A is sin A = length of leg opposite <A over length of hypotenuse = BC over AB
solve a right triangle to find the measures of all of the sides and angles of a right triangle
tangent a trigonometric ratio, abbreviated as tan; for a right triangle ABC, the tangent of the acute angle A is tan A = length of leg opposite <A over length of leg adjacent = BC over AC
trigonometric ratio a ratio of the lengths of two sides in a right triangle
Created by: kgatling