It should be called the fourth of a circle.
Numerically, it's (2pi x r)/4 for the perimeter.
and (pi x r squared) / 4 for the area.
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Circle has 360 degrees. One fourth circle has 90 degrees
one fourth of circle
One fourth of anything plus one half of the same thing is three fourths of it (75%).
75 Percent.
(pi*radius2)/4