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# Geometry, Unit 2

### Right Triangle Trig

TermDefinition
Adjacent side the leg next to an acute angle in a right triangle that is not the hypotenuse
complementary angles two angles whose sum is 90 degrees
cosine a trigonometric function of an acute angle in a right triangle that is the ratio of the length of the side adjacent to the length of the hypotenuse
hypotenuse the side opposite the vertex of the 90 degree angle in a right triangle
opposite side the side across from an angle
ratio the relation between two quantities; can be expressed in words, fractions, decimals, or as a percentage
reciprocal a number that, when multiplied by the original number, has a product of 1
right triangle a triangle with one angle that measures 90 degrees
scale factor A multiple of the lengths of the sides from one figure to the transformed figure. If the scale factor is larger than 1, then the figure is enlarged. If the scale factor is between 0 to 1, then the figure is reduced.
secant the reciprocal of cosine
cosecant the reciprocal of the sine ratio
cotangent the reciprocal of tangent
similar Two figures that are the same shape but not necessarily the same size. Corresponding angles must be congruent and sides must have the same ratio.
sine a trigonometric function of an acute angle in a right triangle that is the ratio of the length of the opposite side to the length of the hypotenuse
tangent a trigonometric function of an acute angle in a right triangle that is the ratio of the length of the opposite side to the length of the adjacent side
theda a Greek letter commonly used to refer to unknown angle measures
trigonometry the study of triangles and the relationships between their sides and the angles between these sides
altitude the perpendicular line from the vertex of a figure to its opposite side; height
angle of depression the angle created by a horizontal ine and a downward line of sight to an object that is below the observer
angel of elevation the angle created by a horizontal line and an upward line of sight to an object that is above the observer
Created by: MHamlin