In[]:=
$PreRead=(*replacesrank-2column-matrixvectorwithrank-1vector*)#/.RowBox[{"(",GridBox[{{a_},{b_}}],")"}]RowBox[{"{",RowBox[{a,",",b}],"}"}]&;crcChord5[{h_,k_},r_,line_]:=RegionPlotImplicitRegion[line,{x,y}],PlotRange
,
,EpilogCircle
,r,Red,PointSize@Large,Point
/.#&/@Solveline,
∈Circle
,r;$PreRead=.;(*unset$PreRead*)
h-2r |
h+2r |
k-2r |
k+2r |
h |
k |
x |
y |
x |
y |
h |
k |
crcChord5[{1,2},3,y-x+1==0]
Out[]=