Geometry textbooks always try to trick you by adding decorative stripes and dotted lines.

If you’re having trouble getting the formulas behind the joke, please see https://www.explainxkcd.com/wiki/index.php/2509:_Useful_Geometry_Formulas.

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# Useful geometric formulas

Geometry textbooks always try to trick you by adding decorative stripes and dotted lines.

If you’re having trouble getting the formulas behind the joke, please see https://www.explainxkcd.com/wiki/index.php/2509:_Useful_Geometry_Formulas.

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