https://doi.org/10.4169/amer.math.monthly.121.03.263 • https://www.jstor.org/stable/10.4169/amer.math.monthly.121.03.263 Copy URL ...
It is important to remember other angles rules, such as angles on a straight line add up to 180°, and to recognise angles in parallel lines. Make sure you are confident in applying Pythagoras’ theorem ...
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