hexagon ABCDEF has the following properties:
i) Diagnols AC, CE and EA are all the same length
ii) angles ABC and CDE are both 90 degrees
iii) all ther sides of the hexagon have lengths which are different
a) what is the minimum perimeter of ABCDEF if AC=sqaure root of 85
b) what is the smallest length of AC for which ABCDEF has all these prperties? what is the minimum perimeter in this case?