private void CalculatePerimeter()
{
for (int i = 0; i < nodes.Count - 1; i++)
{
perimeter += Edge.Length(nodes[i], nodes[i + 1]);
}
perimeter += Edge.Length(nodes[nodes.Count - 1], nodes[0]);
}
public Triangle(Point first, Point second, Point third) // Constructor
{
a = first;
b = second;
c = third;
double e1 = Edge.Length(a, b);
double e2 = Edge.Length(b, c);
double e3 = Edge.Length(a, c);
if (e1 + e2 <= e3 || e1 + e3 <= e2 || e3 + e2 <= e1)
{
throw new ArgumentException("incorrect coordinates");
}
Edge ab = new Edge(first, second);
Edge bc = new Edge(second, third);
Edge ac = new Edge(first, third);
CalculateArea(e1, e2, e3);
CalculatePerimeter(e1, e2, e3);
CalculateIsosceles(e1, e2, e3);
CalculateRight(e1, e2, e3);
}