HP Prime Graphing NW280AAABA manual Select Transform Rotation, GK,angleGK,GL,GM

Rotation	A rotation is a mapping that
	rotates each point by a fixed
	angle around a center point.
	The angle is defined using
	the angle() command,
	with the vertex of the angle
	as the first argument.
	Suppose you wish to rotate
	the square (GC) around point K (GK) through ∡ LKM in the
	figure to the right.
	1.	Press Yand tap		.
	2.	Tap	and select Transform > Rotation.
		rotation() appears on the entry line.
	3.	Between the
		parentheses, enter:
		GK,angle(GK,GL,GM
		),GC
	4.	Press Eor tap
			.
	5.	Press Pto return to
		Plot view to see the rotated square.
More
Projection	A projection is a mapping of one or more points onto an
	object such that the line passing through the point and its
	image is perpendicular to the object at the image point.
	1.	Tap	and select Projection.
	2.	Tap the object onto which points are to be projected and
		press E.
	3.	Tap the point that is to be projected and press E.
		Note the new point added to the target object.
Inversion	An inversion is a mapping involving a center point and a
	scale factor. Specifically, the inversion of point A through
	center C, with scale factor k, maps A onto A’, such that A’ is
	on line CA and CA*CA’=k, where CA and CA’ denote the

Geometry 163