# Teaching Math with the KDE Interactive Geometry Program

Jun 19, 2009, 21:33 (2 Talkback[s])
(Other stories by Mike Diehl)
"Thankfully I read the documentation that came with Kig,
otherwise, I would have missed out on some of its more powerful
features. For example, if you select a curve, say a parabola, from
your diagram, you can use the point tool to create a point on that
curve. Later, you can drag that point around with the mouse, and it
won't leave the curve to which it was constrained. Then, you can
use that point to construct other curves, such as a tangent to the
curve.

"Without reading the documentation, I would have completely
overlooked the Add Text Label function that is available by
right-clicking on a curve. This function doesn't merely add text to
your diagram; there's a text tool for that. The Add Text Label
function lets you display information about a curve, such as slope,
equation, focus and so on. Once the label has been added to the
diagram, you can change various parts of the curve, and the label
will reflect those changes.

"For example, if you created a parabola through three points,
you can add a label that displays the equation of that curve. You
also can create a label that displays the coordinates of the
points. Then, you can move the points around with your mouse, and
see the labels change."

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