if given the central angle and the area of the circle, then by proportion:
Given angle / sector area = 360 / Entire area, then solve for the sector area
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Well a circle has 360 degrees so a sector of 90 degrees has an area equal to 90/360 (or 1/4) of a circle with the equivalent radius. The area of a circle is defined as PI*Radius^2 so the area of a 90 degree sector will be 1/4*PI*Radius^2. The area will be 1/4*3.14*10^2 or 78.5 in^2.
If the circumference or diameter is given then you can find the radius or simply measure the distance from the centre of the circle to the circumference.
It depends on what else is known about the sector: length of arc, area or some other measure.
For A+ it's 20
the formula for the area of a sector is measure of arc/360 times (pi)(radius squared) it should come out to be about 1.046 or 1.047, or 1/3(pi) the formula for the area of a sector is measure of arc/360 times (pi)(radius squared) it should come out to be about 1.046 or 1.047, or 1/3(pi)