HP 39gs Graphing manual Open the Triangle Solver aplet

Open the

Triangle Solver aplet

Choose the triangle type

Specify the known values

1. Open the Triangle Solver aplet.

Select

Triangle Solver

The Triangle Solver aplet opens.

Note: if you have already used the Triangle Solver, the entries and results from the previous use will still be displayed. To start the Triangle Solver afresh, clear the previous entries and results by pressing

CLEAR.

2.If the last time you used the Triangle Solver aplet you used the right-angled triangle input form, that input form is displayed again (as in the

example at the right). If the triangle you are investigating is not a right-angled triangle, or you are not sure what type it is, you should use the general input form (illustrated in the previous step). To switch

to the general input form, press .

If the general input form is displayed and you are

investigating a right-angled triangle, press to display the simpler input form.

3.Using the arrow keys, move to a field whose value

you know, enter the value and press or . Repeat for each known value.

Note that the lengths of the sides are labeled

A, B, and C, and the angles are labeled α, β, and δ. It is important that you enter the known values in the

appropriate fields. In our example, we know the length of two sides and the angle at which those

sides meet. Hence if we specify the lengths of sides A and B, we must enter the angle as δ (since δ is the angle where A and B meet). If instead we entered the

9-2 Triangle Solve aplet