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A 1/4 of a circle is 90 degrees 1/8 of a circle is 45 degrees and they both add up to 135 degrees
There are 360 degrees in any circle. The radius doesn't matter.
If you mean 3/4 of a circle then it is 270 degrees
They are both equal to 90 degrees
An entire circle is 360 degrees. 90 deg is 1/4 of that. Area of a circle is A = pi r^2 area of this sector is (1/4) pi r^2 = (1/4) x 3.14 x 4x4 =12.56