Edge, Element, Equation

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Here's words that start with E. I've collected these from many old Math books since so many of Math books do not have good glossaries.

Teaching Math prefixes is a huge help for kids to learn more words. This page has many words that are derivatives of the word equal, so it is good to teach its meaning as a prefix that means two things that are the same.

**Edge **- outside boundaries.

**Egyptian Fraction** - a number of the form 1/x where x is an integer is called an Egyptian fraction.

**Elapsed Time** - a period of time that has passed, usually between a given starting time and ending time.

**Element** - a member of or an object in a set.

**Elementary Function** - one of the functions: rational functions, trigonometric functions, exponential functions, and logarithmic functions.

**Elements of Percentage** - are the base, the rate, and the percentage.

**Ellipse** - An ellipse is a stretched out circle whose equation is x2/a2+y2/b2=1.

**Ellipsoid** - a three dimensional ellipse whose equation is x2/a2+y2/b2+z2/c2=1.

**Empty Set** - a set with no members. { } Also called the null set.

**End Point Convention** - in histograms, one needs to decide where to count values that are on the exact boundary between two intervals: either in the left or in the right interval. Let readers of the histogram know which side is chosen.

**Endpoints** - the points at which a line segment ends.

**Enumerable Set** - a countable set.

**Hint:** If you teach the word equal and the ways that it is used as a prefix, your students will understand equilateral, equidistant, and equivalent in a snap. Sometimes this can lead to a fun activity showing the number of words that can be made with the prefix equi-.

**Equal** - of the same value.

**Equal sign** - the = sign used to indicate that both sides of an equation have the same value.

**Equality** - a math statement showing that two things are equal.

**Equally Likely** - in probability, when there are the same chances for more than one event to happen, the events are equally likely to occur.

**Equals** - has the same value as.

**Equation** - a math statement showing that two things are equal; It is indicated by this sign = . An equation is a statement of equality existing between numbers or combinations of numbers. An algebraic statement connected by an equal sign.

**Equiangular Polygon** - a polygon all of whose interior angles are equal.

**Equiangular triangle** - a triangle whose three angles all have equal measure. Each angle in an equilateral triangle has a measure of 60 degrees.

**Equichordal Point** - a point inside a closed convex curve in the plane is called an equichordal point if all chords through that point have the same length.

**Equidistant** - the same distance.

**Equilateral Polygon** - a polygon all of whose sides are equal.

**Equilateral Triangle** - a triangle whose sides are all the same length.

**Equivalent equations** - equations that have the same solution set.

**Equivalent Fractions** - different fractions that name the same amount.

**Escribed Circle** - an escribed circle of a triangle is a circle tangent to one side of the triangle and to the extensions of the other sides.

**Estimate** - the best guess arrived at after considering all the information given in a problem.

**Euclidean Algorithm** - the method for finding remainders by multiplying the divisor by the quotient and subtracting that amount from the number being divided.

**Euler Line** - the Euler line of a triangle is the line connecting the centroid and the circumcenter.

**Euler’s Constant** - the limit of the series 1/1+1/2+1/3+...+1/n-ln n as n goes to infinity. Its value is approximately 0.577216.

**Evaluate** - to find the value of an expression.

**Even Function** - a function f(x) is called an even function if f(x)=f(-x) for all x.

**Even Number** - an integer that is divisible by 2; any of the set {..., -6, -4, -2, 0, 2, 4, 6, ...}.

**Event** - in probability, an event is an occurrence or the possibility of an occurrence that is being investigated.

**Exact Interest** - that which is computed by reckoning 365 days to the year.

**Excenter** - the center of an excircle.

**Excircle** - an escribed circle of a triangle.

**Expanded Notation** - a number written out to show all the place values.

**Expected Value** - the amount that is predicted to be gained, using the calculation for average expected payoff.

**Experimental Probability** - the chances of something happening, based on repeated testing and observing results. It is the ratio of the number of times an event occurred to the number of times tested.

**Exponent** - a little number to the right and a bit above a number.; an expression of the number of times that a base is used as a factor.

**Exponential Expression** - an expression that indicates that the base is to be used as a factor the number of times shown by the exponent.

**Exponential Function** - the function f(x)=ex.

**Exponential Function to base a** - the function f(x)=ax.

**Expression** - any combination of symbols, numerals, or operators.

**Exradius** - an exradius of a triangle is the radius of an escribed circle.

**Exterior Angles** - a pair of parallel lines that are intersected with a transversal.

N * O * P * Q * R * S * T * U * V * W * X * Y * Z

I keep these definitions as a glossary in my binder.

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