1. The problem statement, all variables and given/known data Hi, the question just states find the area of the pink, within a square, without giving an equation for the pink boundary line. I did look up the formula for the lens shape but was wondering how to do this with integration. The area of the square is 1 un2. Sorry about the image, wasn't sure if I could post a textbook question. 2. Relevant equations 3. The attempt at a solution Using the area of a lens shape I got (π/2) - 1.