HP Prime Graphing NW280AAABA manual Curve, Special

	four vertices are automatically calculated and the regular
	hexagon is drawn.
Special
Eq. triangle	Produces an equilateral triangle. Tap at one vertex and press
	E. Tap at another vertex and press E. The
	location of the third vertex is automatically calculated and the
	triangle is drawn.
Square	Tap at one vertex and press E. Tap at another vertex
	and press E. The location of the third and fourth
	vertices are automatically calculated and the square is drawn.
Parallelogram	Tap at one vertex and press E. Tap at another vertex
	and press E. Tap at a third vertex and press E.
	The location of the fourth vertex is automatically calculated
	and the parallelogram is drawn.
Curve
Circle	Tap at the center of the circle and press E. Tap at a
	point on the circumference and press E. A circle is
	drawn about the center point with a radius equal to the
	distance between the two tapped points.
	Keyboard shortcut: F
	You can also create a circle by first defining it in Symbolic
	view. The syntax is circle(GA,GB) where A and B are two
	points. A circle is drawn in Plot view such that A and B define
	the diameter of the circle.
Ellipse	Tap at one focus point and press E. Tap at the second
	focus point and press E. Tap at point on the
	circumference and press E.
Hyperbola	Tap at one focus point and press E. Tap at the second
	focus point and press E. Tap at point on one branch of
	the hyperbola and press E.
Parabola	Tap at the focus point and press E. Tap either on a line
	(the directrix) or a ray or segment nd press E.

158 Geometry