## Sunday, November 8, 2015

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

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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