Showing and Hiding Labels

When you point the Text tool at a geometric object, the tool appears as a filled hand.

By default, objects are labeled automatically when you measure them. (Use Text Preferences to turn off this feature.) You can also change Text Preferences so that all new points are labeled when they’re created.

· Click to show the object’s label.

· Click again to hide the object’s label.

Here are the default labels Sketchpad uses for various kinds of objects (before you change them):

Object	Default Label
Point	A, B, C, …
Straight Object	j, k, l, …
Circle	c₁, c₂, c₃, …
Circle Interior	C₁, C₂, C₃, …
Arc	a₁, a₂, a₃, …
Arc Interiors	A₁, A₂, A₃, …
Polygon*	P₁, P₂, P₃, …
Point Locus	L₁, L₂, L₃, …
Non-point Locus	Cannot show a label
Function	f, g, h, …
Function Plot	y=f(x), …
Measurement	m₁, m₂, m₃, …
Parameter	t₁, t₂, t₃, …
Caption	Cannot show a label
Pictures	Cannot show a label
Action Buttons	Label depends on action

* When possible, a polygon with six or fewer vertices is labeled according to its vertices.

If Sketchpad runs out of letters with which to label points or straight objects, it starts over with A₁ and j₁.