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Semi-circles and quarter circles. The perimeter of a semi-circle can be found by using the equation π x r², which is commonly used to calculate the area of a whole circle: area of a semi-circle: 1/2 x π x r. area of a quartercircle: 1/4 x π x r.
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area of a quarter = π r²/4
we can find like this
area of a sector =  Ф/360° x π r²
                     here Ф = 90°

hope it is helpful.pls. mark as best
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