90 degrees
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The full value. But you can get a fourth one free.
It is 90 degrees of the circle's circumference which has a full turn of 360 degrees.
It's one-fourth of the full quantity, also expressed as 1/4, 0.25, or 25%
It is one fourth.
A full circle is 360o, so a quarter, (one fourth) of a circle is 90o.