done

I would say:

• $C$ is the midpoint of $\overline{AB}$
• $\overline{CD}$ is perpendicular to $\overline{AB}$
• $\overline{CF}$ is perpendicular to $\overline{AD}$

These three are sufficent to draw the figure. (Apart of course from $D$ and $F$ are on the semicircles)

Or you just do the math to compute this formula.

Approved Haskell fork. Thx.

Updated fork here based on the updated Python tests

Fixed for C.

Please randomize the order of the inputs and try to cut them down a bit. Currently it does 100 tests per input, resulting in 25600 tests overall.

Haskell fork that tests with all leading octets.

Fixed for Python.

Full tests should test each "relevant" input at least once. (all languages)

This is a server problem. Just try again later.

It puts the null terminator at the end of both strings.

Added in Crystal and Ruby.

Please add fixed tests with edge cases (see other languages)

Please add fixed tests for edge cases (see other languages).