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Disk

WMA link

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

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

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

fills an ellipse.

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

chooses radius 1.

Disk[]

chooses center $(0, 0)$' and radius 1.

Disk[{x, y}, ..., {$t_1$, $t_2$}]

is a sector from angle $t_1$ to $t_2$.

• • Graphics[{Blue, Disk[{0, 0}, {2, 1}]}]

The outer border can be drawn using EdgeForm:

• • Graphics[{EdgeForm[Black], Red, Disk[]}]

Disk can also draw sectors of circles and ellipses

• • Graphics[Disk[{0, 0}, 1, {Pi / 3, 2 Pi / 3}]]

• • Graphics[{Blue, Disk[{0, 0}, {1, 2}, {Pi / 3, 5 Pi / 3}]}]