@@ -0,0 +1,245 @@
+package ru.ematveev.point;%0A%0Apublic class Main%7B%0A%09%09%09%09%09%0A%09public static void main ( String%5B%5D args )%7B%0A%0A%09%09%09Point a = new Point(4, 2);%0A%09%09%09Point b = new Point(5, 3);%0A%09%09%09Point c = new Point(2, 7);%0A%0A%09%09%09double area = new Triangle(a, b, c).area();%0A%0A%0A%09%7D%0A%09%09%0A%7D

add file Main.java