Note that you can separate commands on the same line with semicolons (or commas), though a semicolon will also suppress the printed output (not the graphical output) of a command. Another important command for modifying plots is the axis command, which enables you to modify the scales on the axes. For example, axis tight will cut the axes down to the minimum required to enclose the figure, and axis equal makes the scales on the horizontal and vertical axes the same. This is important to know about if you want your circles to look like circles and not like ellipses. Thus compare the following two ways to plot a semicircle:
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