HP Prime Graphing Calculator - Manual (Page 187)

Geometry 183
affix
Returns the coordinates of a point or both the x- and y-lengths
of a vector as a complex number.
affix(point) or affix(vector)
Example:
if GA is a point at (1, –2), then affix(GA) returns 1–2i.
angle
Returns the measure of a directed angle. The first point is
taken as the vertex of the angle as the next two points in order
give the measure and sign.
angle(vertex, point2, point3)
Example:
angle(GA, GB, GC) returns the measure of ∡ BAC.
arcLen
Returns the length of the arc of a curve between two points on
the curve. The curve is an expression, the independent
variable is declared, and the two points are defined by values
of the independent variable.
This command can also accept a parametric definition of a
curve. In this case, the expression is a list of 2 expressions (the
first for x and the second for y) in terms of a third independent
variable.
arcLen(expr, real1, real2)
Examples:
arcLen(x^2, x, –2, 2) returns 9.29….
arcLen({sin(t), cos(t)}, t, 0, π/2) returns
1.57…
area
Returns the area of a circle or polygon.
area(circle) or area(polygon)
This command can also return the area under a curve
between two points.
area(expr, x=value1..value2)