The فدان : قيراط : سهم app, developed by Omar Mahdi, is a useful tool for calculating the area of a triangle in square meters. The app uses the formula 0.5 ^ (( AREA = (S*( S - A )*( S - B ) * (S - C), where A, B, and C are the lengths of the triangle's sides and S is the semi-perimeter of the triangle. The app then converts the area to units of فدان, قيراط, and سهم.

The app is easy to use and provides accurate results. It is especially useful for those who need to measure land area. The app is free to use and is available for Android devices.