**HP Prime Geometry App Tutorial Part 8: Rotating Triangles**

Today’s lesson will show how to rotate a triangle given an
angle. The angle is in a
counter-clockwise direction.

For the purpose of this lesson, we will set the HP Prime in
Degrees mode.

**Draw the Triangle**

1. Set the calculator
to Degrees mode. Draw a triangle with
vertices (4,4), (4, -4), and (8, 0).

**Rotate the Triangle**

2. Press (Cmds), 7
for Transformation, 3 for Rotation.

3. Select the
reference point. In our example, let’s
make this point (0,0) and press [ Enter ].

4. You are asked for
an angle. Enter 90 for 90°. Press [ Enter ].

**More Rotation**

5. Repeat steps 2
through 4, for angles of 180 and 270.

Thank you. Until next
time, have a great day!

Eddie

This blog is property of Edward Shore. 2015.

Hi Edd, Im always fallowing your posts and learning a lot about programming and many other things .Its very very helpful.

ReplyDeleteI need some help.. i would like to know the Syntax to acces to Geometry app. For exampe, Plot a Matrix..., i know there is a command "plotlist" inside the app but, how can i do that by programming..is it possible?

Thank you very much

Sorry for my poor english :(

Suzuki,

DeleteUnfortunately, geometry commands are not user-friendly and don't work too well (if at all) in programming.

The fastest way to plot lists in a program setting is to switch over the Statistics 2Var app (2-variable statistics app). This one sets the plot screen to Autoscale:

EXPORT LISTPLOT(listx,listy)

BEGIN

// Use Statistics 2 App

STARTAPP("Statistics 2Var");

C1:=listx;

C2:=listy;

CHECK(1);

// Autoscale in Stat 2 plot

STARTVIEW(9);

END;

If you want more control over the view screen x=[xa,xb] and y=[ya,yb], use LSTPLT2:

EXPORT LSTPLT2(listx,listy,xa,xb,ya,yb)

BEGIN

// Use Statistics 2 App

STARTAPP("Statistics 2Var");

C1:=listx;

C2:=listy;

CHECK(1);

// Set the plot screen

Xmin:=xa; Xmax:=xb; Ymin:=ya; Ymax:=yb;

// 1 is plot view in Stat 2 (v. 8151)

STARTVIEW(1);

END;

Hope this helps,

Eddie