Image:Circle centre a b radius r.png

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Circle_center_a_b_radius_r.png‎ (288 × 260 pixels, file size: 2 KB, MIME type: image/png)

Summary

Mathematica source:

ϕ=π/5;
x=Cos[ϕ];
y=Sin[ϕ];
a=1.2;
b=-0.5;

Show[Graphics[{
      Circle[{a,b},1],
      PointSize[0.03],
      Line[{{a+x,b},{a+x,b+y},{a,b},{a+x,b}}],
      Point[{a+x,b+y}],
      Point[{a,b}],
      Text[StyleForm["(a,b)",FontSize\[Rule]13],{a,b-.15}],
      Text[StyleForm["(x,y)",FontSize\[Rule]13],{x+a,y+b+.15}],
      Text[StyleForm["r",FontSize\[Rule]13],{a+x/2+0.15,b+y/2}],
      }],AspectRatio\[Rule]Automatic,Axes\[Rule]True,Ticks\[Rule]Automatic]

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