Right, acute or obtuse?

You will write functions that use the Pythagoras theorem: the hypotenuse, a test that names the kind of triangle, and a search for right triangles with whole-number sides.

Your tasks.

1. In hypotenuse, return the length of the hypotenuse of a right triangle with legs a and b.
2. In kind, sort the three sides, compare the square of the longest with the other two squares added, and return "right", "acute" or "obtuse".
3. In count_triples, return how many whole-number right triangles have a hypotenuse of limit or less. Count each triangle once, with a <= b < c. Then set n_50 to the count for limit = 50.