Jika titik (p,q)\left(p,q\right)(p,q) berada di dalam lingkaran (x−2)2+(y+3)2=9\left(x-2\right)^2+\left(y+3\right)^2=9(x−2)2+(y+3)2=9 maka memenuhi ....
(p−2)2+(q−3)=r2\left(p-2\right)^2+\left(q-3\right)=r^2(p−2)2+(q−3)=r2
(p−3)2+(q−2)2=r2\left(p-3\right)^2+\left(q-2\right)^2=r^2(p−3)2+(q−2)2=r2
(p−2)2+(q−3)<r2\left(p-2\right)^2+\left(q-3\right)<r^2(p−2)2+(q−3)<r2
(2−p)2+(3−q)2<r2\left(2-p\right)^2+\left(3-q\right)^2<r^2(2−p)2+(3−q)2<r2
(2−p)2+(3−q)2>r2\left(2-p\right)^2+\left(3-q\right)^2>r^2(2−p)2+(3−q)2>r2