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an owl
Owls can.
In this Universe EVERY triangle on a flat surface has angles that total 180 degrees. On a sphere the total can be 270 degrees, but I don't think you should bother your pretty little head with that.
There is no simple way to find square roots in your head. You may be able to do it for a small number of perfect squares but that is about it.
There are 30 degrees between the numbers on a clock face - therefore, if the time in hours has passed by a quarter of an hour, then the difference in angle between the head of the hour hand and the head of the minute hand would be 30 x 1/4 = 7.5 degrees.