(pi*radius2)/4
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Circle has 360 degrees. One fourth circle has 90 degrees
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.
one fourth of circle
One fourth of anything plus one half of the same thing is three fourths of it (75%).
75 Percent.