22.- Law of cosines.
In a right triangle we can calculate the c side using the Pythagorean theorem.
If the triangle is not a rectangle, we can calculate the c side using the Law of Cosines.
Build an application where you can change sides a and b and the alpha angle using Sliders and get side c. Draw the triangle.
apk file in external link: http://kio4.com/appinventor/apk_archivos.htm
teorema_cosenos_i.aia (3.6 KB) (unfinished)