Glossary Term scalene triangle Definition A triangle with no congruent sides. scatter plot A graph that shows the general relationship between two sets of data. scientific notation A system of writing numbers using multiplication and powers of ten. A number of the form a × 10n, where 1 < a < 10 and n is an integer. Examples: 95,700 = 9.57 × 104, 0.000024 = 2.4 × 10-5 A line that intersects a circle in two points. In the figure, line CD is a secant of circle P. secant (circle) secant (trigonometry) second (angles) In a right triangle with acute angle A, the secant of A = the measure of the hypotenuse . the measure of the adjacent side A unit of angle measure that is 1 of a minute. 60 second (time) second-order determinant sector A commonly used unit of time. 60 seconds = 1 minute The determinant of a 2 × 2 matrix. A region of a circle bounded by a central angle and its corresponding arc. In the figure, the shaded region is a sector of circle A. segment semicircle (see line segment) Congruent arcs whose endpoints lie on the diameter of the circle.