Thank you for using the timer!
We noticed you are actually not timing your practice. Click the START button first next time you use the timer.
There are many benefits to timing your practice, including:
What we do know though is that AC is twice CD. Call the length of CD X, so AC is 2X. So the other side has to be sqrt 3x^2
We also know that the other side is 0.1m shorter than diagonal AC, or 2x -0.1.
So, sqrt 3x^2 = 2x-0.1
We don't have to solve, but the two together are sufficient to solve.