Students measured their "wingspan" and compared it to their height and determined if they were a square or rectangle.  Our conclusion:

4 out of 29 or 4/29 people in our class are squares = 14% of our class

13 out of 29 or 13/29 are wide rectangles (wingspan is greater than height) = 45% of our class

12 out of 29 or 12/29 are tall rectangles (height is greater than wingspan) = 41% of our class

 . . and 14% + 45% + 41% = 100% of our class