When students get used to radian angles which are fractions of π they sometimes focus so heavily on the fraction that they forget the π needs to be there. It's as if the "π radians" becomes it's own unit of measure.
Here's a nice little check to drop in a lesson as it serves as an accuracy reminder.
Share the first half and then reveal the second half. I'm always surprised to see how many people draw a 135 degree angle for the first (instead of a ~43 degree angle) and then correct it when they see the second part.
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