E
Edge
(of polyhedron) A line segment formed by the intersection of two faces of a
polyhedron
Edge
(of prism) A line segment formed by the intersection of two faces of a prism
Element
A member of a set
Empty
set The set with no elements, represented by 0. (Some mathematicians also
use f I to represent the empty set.)
Endpoint
The point at the end of a line segment or ray.
Equality
(of fractions) Two fractions,
a
Equation
A mathematical sentence with an equals sign to indicate
that two expressions name the same number.
Equiangular
A polygon with equal angles. (Regular polygon).
Equilateral
triangle A triangle in which
all sides are congruent.
Equivalent
equations Equations that
have the same solution.
Equivalent
fractions Fractions that name the same number.
Equivalent
inequalities Inequalities
that have the same solutions.
Estimate
A guess made as the answer to a problem by using numbers which are close in
value to the numbers
used
in the problem)
Evaluate
an expression To replace
a variable in an expression with one of its values and then complete the
indicated
arithmetic.
Event
A specific outcome or type of outcome.
Exact
number The number used to express a count of objects (308)
Expanded
form The method of
representing a number as the sum of products of each digit and powers of 0.
Expanded
notation Writing a number as an indicated sum of face values times place
values (13)
Expected
value The average value that one would expect to get over many attempts.
Experimental
probability An estimated probability based on the relative frequency of
positive outcomes
occurring
during an experiment.
Exponent
A number indicating how many times the base is used as a factor. In 54,
the exponent is 4.
Exterior
angle If the a side of a polygon is extended, an exterior angle is formed.
Extremes of a proportion 0 The first and last terms of a proportion.