using System;
class Program
{
static void Main() {
double a = 5; // length of two equal sides
double _base = 8;
double area = (1 / 2.0) * _base * Math.Sqrt((a * a) - ((_base * _base) / 4));
Console.Write("Area of Isosceles Triangle = " + area);
}
}
/*
run:
Area of Isosceles Triangle = 12
*/