**HP Prime Geometry App Tutorial Part 3: Lines and Line Segments**

With Parts 1 and 2, we will start with a clear plot screen,
with a Plot window of XRange = [ -16, 16 ], YRange = [ -11, 10.9 ], ticks are
at 1. This lesson will focus on drawing
line segments, parallel, and perpendicular lines.

**Midpoint on a Line**

For this part, put the line segment anywhere you wish.

1. Press (Cmds), 3
for Line, 1 for Segment. You are prompted
to select on the segment’s end points. Press
[ Enter ] to select the end point.

2. Select the other end of segment and press [ Enter ]. The segment is designated as object GC.

3. For the Midpoint,
press (Cmds), 2 for Point, 3 for Midpoint.
Select the line segment you have just drawn. Remember, when you cursor over objects that
you are about to select, that object turns red. Press [ Enter ]. The midpoint is plotted, as object GD.

Note that the coordinates the midpoint are not
displayed. Learn how to display the
coordinates in the next segment.

**Display a Point’s Coordinates**

There are two ways to display a point’s coordinates. Try both methods and see which method works
better for you. You can use these
methods of displaying the coordinates for any point.

For this exercise, we’ll concentrate on the midpoint (object
GD).

**The Num Screen Method**

1. Press the [ Num ]
key.

2. Select a blank
line, press (Cmds), 1 for Cartesian, 4 for Coordinates.

3. Type GD and press
[ Enter ].

4. Return the plot
screen by pressing [ Plot ].

**The Plot Screen Method**

1. Press (Cmds), 8
for Cartesian, 4 for Coordinates.

2. Select the point
of interest, press [ Enter ].

Either way, the coordinates of the point are displayed on
top of the screen.

For the next part of the lesson, please clear the plot
screen.

**Draw Parallel and Perpendicular Lines**

1. Draw a line. To recall, press (Cmds), 3 for Line, 3 for
Line. Place the line anywhere you wish,
at any angle you wish. In the pictures
that are displayed, I just chose to place a horizontal line for demonstration purposes
(boring, huh?)

2. Parallel
Line: Press (Cmds), 3 for Line, 4 for
// (Parallel) . Select the line you drew
and press [ Enter ]. Place the parallel
line with a second [ Enter ]. A
parallel line is drawn.

3. Perpendicular
Line: Press (Cmds), 3 for Line, 5 for ⊥ (Perpendicular). Select either of the lines and press [ Enter
]. Place the perpendicular lines by
pressing [ Enter ].

In Part 4 we will work with drawing tangent lines and how to
color objects.

This blog entry is coming from me enjoying a pumpkin vanilla
latte at The Coffee Bean & Tea Leaf in Monrovia, CA. Hope you day is wonderful and see you next
time!

Eddie

This blog is property of Edward Shore. 2015.

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