
Locus
Takes two points as its arguments: the rst is the point whose possible locations form the locus; the second is
a point on an object. This second point drives the rst through its locus as the second moves on its object.
In the following gure, circle C has been drawn and point D is a point placed on C (using the Point On function
described above). Point I is a translation of point D. Choosing Curve > Special > Locus places locus( on the
entry line. Complete the command as locus(GI,GD) and point I traces a path (its locus) that parallels point
D as it moves around the circle to which it is constrained.
Plot
You can plot expressions of the following types in Plot view:
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Function
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Parametric
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Polar
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Sequence
Tap , select Plot, and then the type of expression you want to plot. The entry line is enabled for you to dene
the expression.
Note that the variables you specify for an expression must be in lowercase.
178 Chapter 9 Geometry
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