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Glossary Term stratified random sample Subtraction Property of Equality success supplementary angles surface area survey symmetry synthetic division system of equations system of inequalities systematic random sample tangent Definition A sample in which the population is first divided into similar, nonoverlapping groups; a simple random sample is then selected from each group. If you subtract the same number from each side of an equation, the two sides remain equal. For any numbers a, b, and c, if a = b, then a – c = b – c. Example: if x = 3, then x – 2 = 3 – 2. The desired outcome of an event. Two angles are supplementary if the sum of their measures is 180°. The sum of the areas of all the faces of a three-dimensional figure. A question or set of questions designed to collect data about a specific group of people. A geometric property of a figure in which it can be folded so that each half matches the other exactly or rotated about a point less than 360° so that the final image matches the original figure. A method used to divide a polynomial by a binomial. A set of two or more equations with the same variables. A set of two or more inequalities with the same variables. A sample in which the items in the sample are selected according to a specified time or item interval. In a right triangle with acute angle A, the tangent of ∠A = the measure of the leg opposite A . the measure of the leg adjacent to A tangent line term in an expression term in a sequence terminal side of an angle terminating decimals tessellation tetrahedron theorem A line that intersects a circle or curve in exactly one point. A number, a variable, or a product or quotient of numbers and variables. Each number in a sequence. A ray of an angle that rotates about the center. A decimal whose digits end. Example: 0.2, -1.345 A repetitive pattern of polygons that fit together with no holes or gaps. A triangular pyramid. A statement that can be justified by logical reasoning and must be proven before it is accepted as true.