Ⅰ 鍦嗙殑杞ㄨ抗鏂圭▼鏄浠涔
镙囧嗳鏂圭▼锛(x-a)^2+(y-b)^2=r^2 (a,b)涓哄浑蹇 r涓哄崐寰
涓鑸鏂圭▼锛歺^2+y^2+Dx+Ey+F=0锛坉^2+e^2-4f>0
鍙傛暟鏂圭▼锛歺=a+r*cos胃,y=b+r*sin胃 (a,b)涓哄浑蹇
绔镣瑰纺锛(x-a1)(x-a2)+(y-b1)(y-b2)=0 (a,b)涓哄浑涓婄殑涓镣
鍒囩嚎鏂圭▼ 锛歛0*x+b0*y=r^2