Question 1148867
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Take {{{1/6}}} of the area of the circle with the radius of 5 cm.


Subtract from it the area of the equilateral triangle with the side length of 5 cm.


Take this difference 3 times.


    area = {{{3*((1/6)*pi*5^2 - (1/4)*5^2*sqrt(3))}}} = 6.774 cm^2  (approximately)    <U>ANSWER</U>
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Solved.