definitions for all these words Absolute value Additive Inverse Alternate interior Alternate exterior Association ( between two variables) Bivariate Categorical data Center of dilations Center of rotation Circumference Cluster Coefficient Commission Complementary angles Compound Event Congruent Constant of proportionality Corresponding angle Corresponding sides Cross sections Cone Cylinder Sphere Dependent Variable Dilaton Equation Equivalent Exponent Exponential expression Exterior Angles Expression hypotenuse Initial value Input/output Inverse operations Irrational numbers Rational numbers Line of fit