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How to construct 22.5 degree angle using ruler and compass?

First draw a line. Then draw its perpendicular bisector i.e. 90'. Bisect the 90' angle. You will get an angle of 45'. Bisect it in order to get an angle of 22.5'.

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You can't construct an angIe of 22. 5' by using a compass cuz "22.5" is not a muItipIe of 15 and you can't construst an angIe by using ruIer.

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make 90 degreee angle and thus bisect it by making 45 degree angle and then22.5 degree angle
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