HP Prime Geometry App Tutorial Part 4: Tangent Lines and Changing the Color of
Objects

**Plotting Lines Tangent to a Circle’s Point**

1. Start with a clear
plot screen. Draw a circle: the location of its center and size is up to
you.

2. Press (Cmds), 3
for Line, 6 for Tangent.

3. Select a point on
the circle and press [ Enter ]. The
point is designated as object GD.

4. If you wish,
display the coordinates of GD. See Part
3 as a refresher.

Per HP Prime’s help:
The tangent command draws one or more tangent lines through a specified
point to the circle and the line segment connecting it to the radius.

**Coloring the Tangent Lines**

The following steps is how to color tangent lines. By default, geometric objects are colored
black. Adopt this procedure for any
geometric object you want to designate as a specific color.

1. Move to the
tangent lines so that they turn red.
The (Optns) soft menu appears. It
is key that the (Optns) menu is available.

2. Press (Optns), 1
for Choose Color, choose any color you want.
If the pictures, I have selected blue.
In order to see the different color, move the cursor away from the
tangent lines.

What does Part 5 mean?
It’s time to plot some functions! That is next time.

Eddie

This blog is property of Edward Shore. 2015

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