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Subsections

- Length
- Area
- Distance
- Slope
- Radius
- Parameter
- FirstAxisLength
- SecondAxisLength
- Excentricity
- Integral
- LowerSum
- UpperSum

## Number

###
Length

`Length[`vector`]`
  Length of a vector

`Length[`point A`]`
  Length of the position vector of A

###
Area

`Area[`point A, point B, point C, ...`]`
  Area of the polygon defined by the given points

###
Distance

`Distance[`point A, point B`]`
  Distance of two points A and B

`Distance[`point A, line g`]`
  Distance of a point A and a line g

`Distance[`line g, line h`]`
  Distance of lines g and h. The distance of intersecting lines is 0. This function is interesting for parallel lines.

###
Slope

`Slope[`line`]`
  Slope of a line. This command also draws the slope triangle whose size may be changed (see Properties, 3.1.1).

###
Radius

`Radius[`circle`]`
  Radius of a circle

###
Parameter

`Parameter[`parabola`]`
  Parameter of a parabola (distance of directrix and focus)

###
FirstAxisLength

`FirstAxisLength[`conic`]`
  Length of a conic section's principal axis

###
SecondAxisLength

`SecondAxisLength[`conic`]`
  Length of a conic section's second axis

###
Excentricity

`Excentricity[`conic`]`
  Excentricity of a conic

###
Integral

`Integral[`function f, number a, number b`]`
  Definite integral of f(x) from a to b. This command also draws the area between the function graph of f and the x-axis.

`Integral[`function f, function g, number a, number b`]`
  Definite integral of f(x)-g(x) from a to b. This command also draws the area between the function graphs of f and g.

See indefinte integral, 4.3.11.

###
LowerSum

`LowerSum[`function f, number a, number b, number n`]`
  lower sum of function f on interval [a,b] with n rectangles. This command draws the rectangles of the lower sum too.

###
UpperSum

`UpperSum[`function f, number a, number b, number n`]`
  upper sum of function f on interval [a,b] with n rectangles. This command draws the rectangles of the upper sum too.

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