photo and math courtesy of Saurabh Dani
New math rule: 40+ feet is about 80% of 30 feet. Here is the proof:
Reader say rendering is out of scale
Print the attached image and then measure the two red arrows. The building which is supposed to be 40+ feet high has an arrow which is 80% in length of the street width’s red arrow. Hence Proved (that 40+ is shorter than 30)!!.