In the figure below, ABCD is a rectangle, EFGH is a square, and `bar(CD)` is a diameter of a semicircle. Point K is the midpoint of `bar(CD)`. Point J is the midpoint of both `bar(AB)` and `bar(EF)`. Points E and F lie on `bar(AB)`. The 3 given lengths are in meters.

What is the length, in meters, of are `bar(CD)`?