Given three numbers, x, y and z, determine whether they are the edges of a right angled triangle.
right_triangle(3, 4, 5) ➞ True
# This is the classic example of a "nice" right angled triangle.
right_triangle(145, 105, 100) ➞ True
# This is a less famous example.
right_triangle(70, 130, 110) ➞ False
# This isn't a right angled triangle.