EMF 5

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r=5
\left(x-a\right)^{2}+\left(y-s\right)^{2}<r^{2}
a=0
s=0
x=-5\left\{s-15\le y\le s\right\}
x=5\left\{s-15\le y\le s\right\}
\left(x-h\right)^{2}+\left(y-k\right)^{2}=r^{2}
h=5
k=s-20
\left(x-f\right)^{2}+\left(y-t\right)^{2}=r^{2}
f=-5
t=s-20