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what is the formula for area of a sector of a circle. Let this region be a sector forming an angle of 360 at the centre O. P r 2 displaystyle pi r 2.
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After converting the diameter to the radius you are ready to use the formula. P r 2 displaystyle pi r 2. From the proportion we can easily find the final sector area formula.
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The same method may be used to find arc length - all you need to remember is the formula for a circles circumference. A p r 2 displaystyle Api r 2 to calculate the area of the circle. Th 2p p r2. What the formulae are doing is taking the area of the whole circle and then taking a fraction of that depending on what fraction of the circle the sector fills.
