TY JOUR TI Circles on the Complex Plane KW circle: real KW imaginary KW degenerated; real circle + imaginary complement; imaginary circle + actual complement; zero circle + left and right isotropies; right angle: real KW imaginary; radical axis; radical center; sphere JO Geometry & Graphics AU Girsh, A.G. PY 2020 IS 8 PB INFRA-M Academic Publishing LLC.