A (not too hard) coffee time puzzle this week. Go grab a pencil, a cup of coffee, and dust off a little geometery.
To the left is a unit square.
A semi-circle is constructed inside the square with a diameter of one unit.
The yellow line starts at the top corner, and is tangent to the semi-circle.
What is the length of the yellow line?
Give yourself five minutes, then push the solution button to check your answer.