It is 22.5
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There are 90 degrees
A 90% US silver quarter contains .18084oz of pure silver, or 5.12672 grams. All quaters before 1965 had this 90% composition.
0.25 x 90 = 22.5 Therefore, a quarter of 90 degrees is 22.5 degrees.
1/4 of a circle is a 90 degree turn
A right angle is one quarter of a revolution and it measures 90 degrees.