HP Prime Graphing Calculator - Manual (Page 185)

Geometry 181
Measure Plot
angleat
Used in Symbolic view. Given the three points of an angle and
a fourth point as a location, displays the measure of the angle
defined by the first three points. The measure is displayed,
with a label, at the location in the Plot view given by the fourth
point. The first point is the vertex of the angle.
angleat(point1, point2, point3, point4)
Example:
In degree mode, angleat(point(0, 0), point(2√3,
0), point(2√3, 3), point(-6, 6)) displays
“appoint(0,0)=30.0” at point (–6,6)
angleatraw
Works the same as angleat, but without the label.
areaat
Used in Symbolic view. Displays the algebraic area of a
polygon or circle. The measure is displayed, with a label, at
the given point in Plot view.
areaat(polygon, point) or areaat(circle,
point)
Example:
areaat(circle(x^2+y^2=1), point(-4,4))
displays “acircle(x^2+y^2=1)= π” at point (-4, 4))
areaatraw
Works the same as areaat, but without the label.
distanceat
Used in Symbolic view. Displays the distance between 2
geometrical objects. The measure is displayed, with a label,
at the given point in Plot view.
distanceat(object1, object2, point)
Example:
distanceat(1+i, 3+3*i, 4+4*i)
returns “
1+i
3+3*i=2√2”
at point (4,4)