HP Prime Geometry App Tutorial Part 2: Triangles
Like Part 1, we’ll use a Plot window of XRange = [ -16, 16
], YRange = [ -11, 10.9 ], ticks are at 1.
For this lesson, we are going to focus on triangles. Start with a clear Plot Screen ([Shift], [
Esc ] (Clear)).
Drawing a Triangle
1. On the plot
screen, press the soft key (Cmds), then select 4 for Polygon and 1 for Triangle.
2. Select the first vertex
(corner point) and press [ Enter ]. For
this lesson, put the triangle wherever you want.
3. Place the second
and third vertex. Press [ Enter ] after
each point. The vertices are labeled A,
B, and C.
Finding an Angle
The steps will demonstrate how to find the angle. Be aware that the direction you enter the
vertexes will determine the sign of the angle.
1. Press (Cmds), 9
for Measure, 6 for Angle.
2. Select one vertex,
press [Enter]. Follow the triangle to
select the second vertex (where the angle will be measured), press [ Enter
]. Follow that with a third vertex and
press [Enter]. The angle displayed on
top of the screen.
Resizing the Triangle
Click on one of the points of the points. Then drag the point with the arrow pad. When satisfied, press [ Enter ].
For the last part, clear the screen.
Reflect a Triangle –
reflect about a point
1. Clear the screen. ([ Shift ] [ Esc ] (Clear))
2. Draw a triangle
with the vertices (-6, -4), (-6, 4), and (-12, 0).
3. Press (Cmds), 7
for Transform, 2 for Reflection.
4. You will be promoted
for a reflection point. For this exercise,
set the point at (0,0).
5. Select the
triangle (scroll until the triangle turns red) and press [ Enter ].
In Part 3, we’re going to work with lines and line
segments. Until next time, have a great
day!
Eddie
This blog is property of Edward Shore. 2015.
