![]() (opp/hyp) Cosine, cos For an acute angle of a right triangle the ratio of the side adjacent to the angle to the measure of the hypotenuse. 1 Definitions, s and s Name: Definitions Complementary Angles Two angles whose measures have a sum of 90 o Supplementary Angles Two angles whose measures have a sum of 180 o A statement that can be proven Vertical Angles Transversal Two angles formed by intersecting lines and facing in the opposite direction A line that intersects two lines in the same plane at different points Corresponding Pairs of angles formed by two lines and a angles transversal that make an F pattern Same-side interior Pairs of angles formed by two lines and a angles transversal that make a C pattern Alternate interior Pairs of angles formed by two lines and a angles transversal that make a Z pattern Congruent triangles Triangles in which corresponding parts (sides and angles) are equal in measure Similar triangles Angle bisector Segment bisector Legs of an isosceles triangle Base of an isosceles triangle Equiangular Perpendicular bisector Altitude Triangles in which corresponding angles are equal in measure and corresponding sides are in proportion (ratios equal) A ray that begins at the vertex of an angle and divides the angle into two angles of equal measure A ray, line or segment that divides a segment into two parts of equal measure The sides of equal measure in an isosceles triangle The third side of an isosceles triangle Having angles that are all equal in measure A line that bisects a segment and is perpendicular to it A segment from a vertex of a triangle perpendicular to the line containing the opposite side of 11ΔΆ Definitions, s and s Definitions Geometric mean The value of x in proportion a/x = x/b where a, b, and x are positive numbers (x is the geometric mean between a and b) Sine, sin For an acute angle of a right triangle, the ratio of the side opposite the angle to the measure of the hypotenuse.
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