Math Dictionary e
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The number "e" is one of the most important numbers in mathematics.
The first few digits are: 2.7182818284590452353602874713527 (and more ...)
It is often called Euler's number after Leonhard Euler.
How much a "conic section" (a circle, ellipse, parabola or hyperbola) varies from being circular. Example: A circle has an eccentricity of zero.
Edge of a polyhedron: :
A line segment that connects two consecutive vertices of a polyhedron.
A member of a set.
A set of points 1 P in a plane, such that the sum of the distances from P to two fixed points 1 F and 2 F is a given constant k . Any plane section of a circular conical surface which is a closed curve.
A point at either the end of a line segment, or arc, or the initial point of a ray.
Equal Chords :
Two chords which are equidistant from the center are called equal chords.
A polygon with all interior angles congruent.
An equation says that two things are the same, using mathematical symbols.
At the same distance.
A polygon with all sides congruent.
Equilateral triangle :
A triangle with three congruent sides.
The time of the year when day and night are each 12 hours long and the Sun is at the midpoint of the sky.This happens twice a year:
* Spring equinox
* Autumn (Fall) equinox
A relation that exhibits the reflexive, symmetric, and transitive properties.
Equivalent fraction :
Fractions which have the same value, even though they may look different.
Example 1/2 and 2/4 are equivalent, because they are both "half".
Finding a value that is close enough to the right answer, usually with some thought or calculation involved.
The study of geometry based on definitions undefined terms (point, line and plane) and the assumptions of Euclid (c.a. 330 B.C.)
Euclidean Parallel Postulate:
Any assumption equivalent to the following statement: If l is any line and P is any point not on l , then there exists exactly one line through P that is parallel to l .
For any given triangle, the line that contains the circumcenter, the centroid and the orthocenter.
Any integer that can be divided exactly by 2.
The last digit will be 0, 2, 4, 6 or 8
The exponent of a number shows you how many times the number is to be used in a multiplication.
Numbers, symbols and operators (such as + and ×) grouped together that show the value of something.
External segment of a secant :
If a secant is drawn to a circle from an external point, the portion of the secant that lies outside the circle.
Exterior of a geometric figure:
The set of all points outside a geometric figure.
Exterior angle of a polygon:
An angle formed by a side of a polygon and the extension of an adjacent side.
Math dictionary e
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