In a quadrilateral ABCD, ∠B=90°, AD2=AB2+BC2+CD2 , prove that ∠ACD=90°

In a quadrilateral ABCD, $∠ B = 90 °, A D^{2} = A B^{2} + B C^{2} + C D^{2}$ , prove that $∠ A C D = 90 °$

Mixed-up sentence exercise

Put the parts in order to form a sentence. When you think your answer is correct, click on "Check" to check your answer. If you get stuck, click on "Hint" to find out the next correct part.