What is the range of possible sizes for side xxx 6.0 and 5.8

Name the quadrilaterals that have four equal sides.

The distribution of the amount of money spent by students for textbooks in a semester is approximately normal in shape with a mean of $235 and a standard deviation of $20. according to the standard deviation rule, how much did almost all (99.7%) of the students spend on textbooks in a semester?

This is about circle theorems. someone asap : (