HP Prime Graphing NW280AAABA manual Affix, Angle, ArcLen, Area

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)

Geometry 183