Which theorem explains why the circumcenter is equidistance

Tom had a total of $220 and he spent $35 on a basketball ticket . what percent of his money did he have left?

To solve the system of equations below, pedro isolated the variable y in the first equation and then substituted it into the second equation. what was the resulting equation? { 5y=10x {x^2+y^2=36

Abcd is a square. what is the measure of angle bac