Dictionary-E deals with words starting with letter **E**.

- The eccentricity of a circle is 0.
- The eccentricity of ellipse is 0
- The eccentricity of parabola is 1.
- The eccentricity of hyperbola is greater than 1.

It is an important mathematical constant approximately equal to 2.71828. Other names are

Math dictionary-e deals with words starting with letter **E**.

It is an important mathematical constant approximately equal to 2.71828. Other names are

__Eccentricity:__

In math, eccentricity is a parameter associated with conic section, that is how much the conic section deviates from being a circle. Eccentricity is denoted by 'e' or 'ε'

- More words of math dictionary-e as follows.

A line that connects two vertices of a polygon.

A member or constituent of a set. For example 'a' is an element of the set {a,b,c,d}

__Ellipse__

A curved line forming a closed loop, where the sum of the distances from the two foci to every point on the line is constant. or Set of all points for which the sum of the distance from the two foci are always constant.

**Empty set:**

An empty set is a set with no elements. It is denoted by** { }. **It is also denoted by **∅.**__End point:__

The point at which a line or a ray terminates or ends.

**Equation:**

A math statement showing that two things are equal.

For example, 5-2 = 7-4__Equation of the tangent__

A tangent to a circle is a straight line which intersects (touches) the circle exactly one point.We can draw only two tangents to a circle from the point outside to a circle.

To get the equation of a tangent at(x₁,y₁) we have to replace x² by xx₁, y² by yy₁ , x as (x + x₁)/2 and y as (y + y₁)/2 in the equation of a circle. __Equation of the line__

A linear equation or an equation of the first degree in x and y represents a straight line.The equation of a straight line is satisfied by the co-ordinates of every point lying on the straight line and not by any other point outside the straight line.

(i) Slope intercept form: y = m x + b

Here m = slope and b = y-intercept

(ii)Two point form:

(y-y1)/(y2-y1) = (x-x1)/(x2-x1)

Here (x1,y1) and (x2,y2) are the points on the line.

(iii) Point- Slope form:

(y-y1) = m (x-x1)

Here m = slope and (x1,y1) are the given point on the line.

(iv) Intercept form:

(X/a) + (Y/b) = 1

Here a = x-intercept and b= y-intercept

**Equidistant: **

Equidistant means same distance between two points or two things.

**Equilateral triangle:**

A triangle with three equal sides is called equilateral triangle.

**quivalent:**

Equivalent denotes the equal values.

{a,e,i,o,u} and {x: x is an vowel} are equivalent sets.

**Even number:**

A number which is exactly divided by 2 is called even number.

{2, 4, 6, 8...} is set of all even numbers

**Exponent:**

Exponent is the power of a number which denotes how many times the number should be multiplied.

3⁴ = 3x3x3x3

**Exterior angles:**

Angle between any side of shape and a extended line.

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