Q$-11.$ With the Point class definition as given in the above question, write the definition of a Triangle class that uses $3$ Point objects as its vertices. The class should have an appropriate constructor method that returns a string representation of the trianle. Write three other methods for the triangle class as specified below :

$($a$)$ An area method that finds and returns the area of the triagle by using the lengths a$,$b$,$c of the three sides of the triangle.

$($b$)$ Write a boolean method isPossible that tests whether the triangle with the given vertices is possible with the criterian that the length of any of the sides of the triangle $a,b,c$ should not exceed the sum of lengths of the other two sides.

$($c$)$ Write another boolean method isEquilateral that decides whether the triangle is equilateral or not.