public void TestTriangle()
{
var expected = 6.78;
var tr = new Triangle(4, 4, 7);
Assert.AreEqual(tr.IsRightAngled(), false);
Assert.AreEqual(expected, Math.Round(tr.GetSquare(), 2));
expected = 6;
tr = new Triangle(3, 4, 5);
Assert.AreEqual(tr.IsRightAngled(), true);
Assert.AreEqual(expected, tr.GetSquare());
}