HP 39gII - The Triangle Solver App

40 HP Apps: Solvers and Explorers
HP Apps: Solvers and Explorers40
The Triangle Solver App
This App solves many kinds of geometric and trigonometric problems involving triangles. Press Apps, scroll to the Triangle Solver app,
and press the START menu key to get started. The Triangle Solver opens in the Numeric view. Table 14 summarizes the functionality of this
app.
Table 14- Triangle Solver HP App
Summary of Functionality View Name and Display
Each triangle has 3 side lengths (A, B, and C) and three angles, each opposite one of the
sides ( , , and respectively). Enter any 3 values (one must be a length) and the Solver
will find the other values. Note the Degrees/Radians menu key shows you how angles are
currently measured. Press the Degrees/Radians menu key to change this setting. The menu
items are:
• EDIT: opens an input box to edit the chosen value
• Degrees/Radians: toggles the angle measure mode between degrees and radians
• RECT: toggles between general- and right-triangle forms for problem solving
• SOLVE: solves for the remaining values
Triangle Solver
Example
A triangle has consecutive sides of lengths 9 and 6. The angle opposite the second side
measures 30°. Find the length of the third side.
Example 1
α
β
δ