HP Prime Graphing Wireless Calculator - Manual (Page 42)

38 Geometry
Radius Tap a circle and press E to select it. The radius of the
circle is displayed.
Perimeter Tap a circle and press E to select it. The perimeter of the
circle is displayed.
Slope Tap a straight object (segment, line, and so on) and press
E
to select it. The slope of the object is displayed.
Area Tap a circle or polygon and press E to select it. The area
of the object is displayed.
Angle Tap a point and press E to select it. Repeat to select
three points. The measure of the directed angle from the
second point through the third point, with the first point as
vertex, is displayed.
Arc Length Tap a curve and press E to select it. Then, enter a start
value and a stop value. The length of the arc on the curve
between the two x-values is displayed.
Tests
Collinear Tap a point and press E to select it. Repeat to select
three points. The test appears at the top of the display, along
with its result. The test returns 1 if the points are collinear;
otherwise, it returns 0.
On circle Tap a point and press E to select it. Repeat to select four
points. The test appears at the top of the display, along with
its result. The test returns 1 if the points are on the same circle;
otherwise, it returns 0.
On object Tap a point and press E to select it. Then tap an object
and press E. The test appears at the top of the display,
along with its result. The test returns 1 if the point is on the
object; otherwise, it returns 0.
Parallel Tap a straight object (segment, line, and so on) and press
E
to select it. Then tap another straight object and press
E . The test appears at the top of the display, along with