Expression 14: StartRoot, left parenthesis, "x" minus "x" Subscript, 1 , Baseline , right parenthesis squared plus left parenthesis, "y" minus "y" Subscript, 1 , Baseline , right parenthesis squared , EndRoot times StartRoot, left parenthesis, "x" minus "x" Subscript, 2 , Baseline , right parenthesis squared plus left parenthesis, "y" minus "y" Subscript, 2 , Baseline , right parenthesis squared , EndRoot times StartRoot, left parenthesis, "x" minus "x" Subscript, 3 , Baseline , right parenthesis squared plus left parenthesis, "y" minus "y" Subscript, 3 , Baseline , right parenthesis squared , EndRoot equals "r" cubedx−x12+y−y12·x−x22+y−y22·x−x32+y−y32=r3