HP Prime Graphing NW280AAABA manual Polygon, Ngon

Parallel	Tap on a point (P) and press E. Tap on a line (L) and
	press E. A new line is draw parallel to L and passing
	through P.
Perpendicular	Tap on a point (P) and press E. Tap on a line (L) and
	press E. A new line is draw perpendicular to L and
	passing through P.
Tangent	Tap on a curve (C) and press E. Tap on a point (P) and
	press E. If the point (P) is on the curve (C), then a single
	tangent is drawn. If the point (P) is not on the curve (C), then
	zero or more tangents may be drawn.
Median	Tap on a point (A) and press E. Tap on a segment and
	press E. A line is drawn through the point (A) and the
	midpoint of the segment.
Altitude	Tap on a point (A) and press E. Tap on a segment and
	press E. A line is drawn through the point (A)
	perpendicular to the segment (or its extension).
Polygon	The Polygon menu provides tools for drawing various
	polygons.
Triangle	Tap at each vertex, pressing Eafter each tap.
	Keyboard shortcut: n
Quadrilateral	Tap at each vertex, pressing Eafter each tap.
Ngon
Polygon5	Produces a pentagon. Tap at each vertex, pressing E
	after each tap.
Polygon6	Produces a hexagon. Tap at each vertex, pressing E
	after each tap.
Hexagon	Produces a regular hexagon (that is, one with sides of equal
	length and angles of equal measure). Tap on a point and
	press E. Tap on a second point to define the length of
	one side of the regular hexagon and press E. The other

Geometry 157