The coordinates of triangle fgh are f(2, 4), g(5, −9) and h(−3, −4). which statement proves that triangle fgh is a right triangle? (m = y2 - y1 x2 - x1 ) a) the slope of gh = 5 8 , and the slope of fh = 8 5 ; therefore, gh ⊥ fh. b) the slope of fg = − 5 8 , and the slope of gh = 5 8 ; therefore, fg ⊥ gh. c) the slope of gh = − 5 8 , and the slope of fh = 8 5 ; therefore, gh ⊥ fh. d) the slope of gh = − 8 5 , and the slope of fh = − 5 8 ; therefore, gh ⊥ fh.