The points D(-2,2), E(2,5), and F(5,1) form ADEF in the coordinate plane.
What condition verifies that the triangle is a right triangle?
OA. Three of the sides of the triangle are equal.
B. The product of the slopes of two of the sides is −1.
OC. The product of the slopes of two of the sides is 1.
OD. Two of the sides of the triangle are equal.
