(50 points) the hypotenuse of a right triangle has endpoints a(4, 1) and b(–1, –2). at which points could the vertex of the right angle in the triangle be located? check all that apply. a) (–1, 1) b) (4, –2) c) (1, 1) d) (2, –2) e) (4, –1) f) (–1, 4)