Find the shaded area.
AH = 5
[ABCD] = 24
[AFCH] = 24 - (3 * 4) = 12
EF = 12 / 5 = 2.4
EH = 5 - sqrt(32 - 2.42) = 3.2
[EFGH] = 2.4 * 3.2 = 7.68 units squared