More or less a beta version (its been tested, but not stress tested). Its coded for the TI-89. The ASCII/Text versions are posted as well in case someone has the urge to convert it for another calculator. Its been a while since I’ve done any TI BASIC coding so this was hammered out without too much thought in organizing the code.

Text version
TI ASCII Program version
TI-89 Program (right-click and save-as)

To use, just provide 3 parts of the triangle and the program will calculate the other 3 parts. If there’s 2 solutions available, it will produce the 2nd solution as well.