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divisor

a number of quantity that divides another number or quantity

dodecagon

a polygon with twelve sides

domain of a function

the set of numbers which are permissible replacement values for the independent variable of a function

element of a set

any one of the individual objects or members belonging to a set

empty set

the set that has no members

equality

the property of two things being equal and symbolized by the equals sign

equals sign

symbol of equality

equation

an algebraic statement consisting of two algebraic expressions connected by an equals sign

equiangular polygon

a polygon whose angles all have equal measure

equiangular triangle

a triangle whose three angles all have equal measure