We have used various reference sources for the information supplied here, among them are:-
Wikipedia(http://www.wikipedia.org), the free encyclopedia
Machinerys Handbook 28th Edition
Gieck Engineering Formulas 8th Edition
Kempes Engineers Yearbook
Thanks toostermiller.orgfor providing this scientific calculator and triangle solver under the terms of the GNU General Public License.
The triangle solver has been modified to include in and out radius and diameter.