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Circle

WMA link

Circle[{$c_x$, $c_y$}, r]

draws a circle with center ($c_x$, $c_y$) and radius r.

Circle[{$c_x$, $c_y$}, {$r_x$, $r_y$}]

draws an ellipse.

Circle[{$c_x$, $c_y$}]

chooses radius 1.

Circle[]

chooses center (0, 0) and radius 1.

• • Graphics[{Red, Circle[{0, 0}, {2, 1}]}]

• • Graphics[{Circle[], Disk[{0, 0}, {1, 1}, {0, 2.1}]}]

Target practice:

• • Graphics[Circle[], Axes-> True]