HP Prime Graphing NW280AAABA manual More

	placed on a circle will remain on that circle regardless of how
	you move the point.
	If there is no object where you tap, a point is created if you
	then press E.
Midpoint	Tap where you want one point to be and press E. Tap
	where you want the other point to be and press E. A
	point is automatically created midway between those two
	points.
	If you choose an object first—such as a segment—choosing
	the Midpoint tool and pressing Eadds a point midway
	between the ends of that object. (In the case of a circle, the
	midpoint is created at the circle’s center.)
Intersection	Tap the desired intersection and press E. A point is
	created at one of the points of intersection.
	Keyboard shortcut: g
More
Trace	Displays a list of points for
	you to choose the one you
	want to trace. If you
	subsequently move that
	point, a trace line is drawn
	on the screen to show its
	path. In the example at the
	right, point B was chosen to
	be traced. When that point was moved—up and to the left—a
	path of its movement was created.
	Trace creates an entry in Symbolic view. In the example
	above, the entry is Trace(GB).
Stop Trace	Turns off tracing and deletes the definition of the trace point
	from Symbolic view. If more than one point is being traced, a
	menu of trace points appears so that you can choose which
	one to untrace.
	Stop Trace does not erase any existing trace lines. It merely
	prevents any further tracing should the point be moved again.

154 Geometry