Expression 3: StartAbsoluteValue, 2 left parenthesis, "x" squared plus "y" squared , right parenthesis minus left parenthesis, "R" squared plus "R" squared , right parenthesis , EndAbsoluteValue less than or equal to StartAbsoluteValue, "R" squared minus "R" squared , EndAbsoluteValue Has graph.2x2+y2−R20+R21≤R20−R21