Application Guide

Note: The default step value for quantization of the parabola coefficients is 1/32. The
denominator of this fraction can be redefined using a variable named ti_gg_fd.par_
quant. You can change the step value in the current problem by setting this variable to
a value greater or equal to 2. A value of 2, for example, produces a step value of 0.5.
Using MathDraw to Measure an Angle
To measure the angle between two existing lines, use the touchscreen to draw a circle
arc from one of the lines to the other.
• If the intersection point between the two lines does not exist, it is created and
labeled.
• The angle is not a directed angle.
Using MathDraw to Find a Mid-point
To create a point midway between two points, tap point1, point2, and then point1
again.
Using MathDraw to Erase
To erase objects, use the touchscreen to drag left and right, similar to the motion of
erasing a whiteboard.
• The erasure area is the bounding rectangle of the erasure gesture.
• All point objects and their dependents inside the erasure area are removed.
Graphs Application 78