Take the Cartesian coordinate system O- xy . If an arbitrary point on the circumference of a circle centered at fixed point C ( h , k ) is P ( x , y ) and CP = r (radius), then the relationship ( x - h ) 2 + ( y - k ) 2 = r 2 holds. This is the equation of a circle. Moving point P is on the circumference of this circle if and only if its coordinates satisfy this equation. Alternatively, expanding this, x 2 + y 2 + ax + by + c = 0 ( a 2 + b 2 > 4 c ) is the equation of a circle. Source: Encyclopaedia Britannica Concise Encyclopedia About Encyclopaedia Britannica Concise Encyclopedia Information |
直交座標系O- xy をとる。定点C (h,k) を中心とする円周上の任意の点をP (x,y) とし,CP=r (半径) とすれば,関係式 (x-h)2+(y-k)2=r2 が成り立つ。これが円の方程式である。動点P は,その座標がこの方程式を満たすとき,およびそのときに限って,この円の円周上にある。あるいはこれを展開した x2+y2+ax+by+c=0 ( a2+b2>4c ) が円の方程式である。
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