Ⅰ 鍦嗙殑杞ㄨ抗鏂圭▼鏄浠涔
鏍囧噯鏂圭▼錛(x-a)^2+(y-b)^2=r^2 (a,b)涓哄渾蹇 r涓哄崐寰
涓鑸鏂圭▼錛歺^2+y^2+Dx+Ey+F=0錛坉^2+e^2-4f>0
鍙傛暟鏂圭▼錛歺=a+r*cos胃,y=b+r*sin胃 (a,b)涓哄渾蹇
絝鐐瑰紡錛(x-a1)(x-a2)+(y-b1)(y-b2)=0 (a,b)涓哄渾涓婄殑涓鐐
鍒囩嚎鏂圭▼ 錛歛0*x+b0*y=r^2