mathematics question

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eevxv917

Mathematics

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area of sector=30/360*pie*r^2

area of triangle= 0.5 *r^2 *sin30

shaded=1/12r^2*pie-0.25r^2=5

R^2(1/12pie-0.25)=5

r^2=5/1/12pie-0.25

r=squareroot of 5/1/12pie-0.25

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