What are The vertices of are D(7 3) E(4 -3) and F(10 -3). Write a paragraph proof to prove that is isosceles.?

If vertices are at (7, 3) (4, -3) and (10, -3) then it is an isosceles triangle because by using the distance formula it has 2 equal sides of 3 Times Square root 5 and a 3rd side of 6.