Random questions from my math class

#20 stereo got right but you're basically looking for the area of the overlapped secction. Had no reasoning though f3

In order to get Stereo's answer, you would have to assume that C is the center of the 4 inch square. <~ Reasoning

Otherwise, since there's no definite intersection point, you can rotate the square in any direction, and slide it back and forth and the answer would be 0 < area < 16. (If you've taken geometry, you should know about this.)

Shading the overlapping has nothing to do with clarity because it's clear from your diagram where they overlap.