Difference between revisions of "Lines and Axes"
From GeoGebra Manual
m (Text replace - "<div class="box info"> 48px|left This page is part of the official manual for print and pdf. For structural reasons normal users can't edit this page. If you found any errors on this page please contact ) |
m |
||
Line 1: | Line 1: | ||
− | <noinclude>{{Manual Page|version= | + | <noinclude>{{Manual Page|version=5.0}}</noinclude>{{objects|geometric}} |
− | {{objects|geometric}} | ||
==Lines== | ==Lines== | ||
You can enter a line as a linear equation in ''x'' and ''y'' or in parametric form into the Input Bar. In both cases previously defined variables (e. g. numbers, points, vectors) can be used within the equation. | You can enter a line as a linear equation in ''x'' and ''y'' or in parametric form into the Input Bar. In both cases previously defined variables (e. g. numbers, points, vectors) can be used within the equation. |
Revision as of 10:32, 6 August 2015
Lines
You can enter a line as a linear equation in x and y or in parametric form into the Input Bar. In both cases previously defined variables (e. g. numbers, points, vectors) can be used within the equation.
Note: You can enter a line’s name at the beginning of the input followed by a colon.
Example:
- Type in
g: 3x + 4y = 2
to enter line g as a linear equation. - You can enter a line in parametric form thus:
g: X = (-5, 5) + t (4, -3)
- Define the parameters m = 2 and b = -1. Then, you can enter the equation
h: y = m*x + b
to get a line h in y-intercept-form.
Axes
The two coordinate axes are available in commands using the names xAxis and yAxis.
Example: The command
PerpendicularLine[A, xAxis]
constructs the perpendicular line to the x-axis through a given point A.Comments
Get parameters of a line[edit]
From the line a: 2.2 x + 3.3 y = 4.4
you'll get with
x(a)
the value 2.2y(a)
the value 3.3z(a)
the value -4.4 (because GeoGebra save the line equation as2.2 x + 3.3 y - 4.4 = 0
.
More informations: Coefficients Command