abstract:Conchoids of line with common center.The fixed point O is the red dot, the black line is the given curve, and each pair of coloured curves is length d from the intersection with the line that a ray through O makes.
conchoid_数学行业词汇
蚌线
conchoid词源英文解释
Greek konchoeidēs, literally, conchlike, from konch- conch- + -oeidēs -oid