I think "u" stands for units. 
means units squared which is like saying ft^2 if you were looking for the area of something with feet dimensions. So in this case, the circle has a diameter of x units (u) and an area of x units^2 (
). It is not the same as r. "r" is most always going to be used to represent the radius.
Step-by-step explanation:
ofc , so that is that and the other is that
Answer:4 units down and 2 units right if I’m wrong I’m sry
Step-by-step explanation:
-1/2 is rational, have a good day
