What kind of triangle is it?

Three corners are enough to name a triangle. You will compare the squares of its sides, so that no square root ever gets rounded.

The idea. Equal squared sides mean equal sides. A right angle shows up as $a^2 + b^2 = c^2$, with $c$ the longest side.

Your tasks.

1. In d2, return the square of the distance between two points.
2. In kind, return "equilateral", "isosceles" or "scalene".
3. In right, return True if the triangle has a right angle.