A point X lies in the interior of rectangle ABCD. If AX = 11 cm, BX = 11 cm and CX = 10 cm, what is DX? Express your answer in simplest radical form.
We have this relationship :
AX^2 + CX^2 = BX^2 + DX^2
11^2 + 10^2 = 11^2 + DX^2
100 = DX^2
10 = DX
