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the cross-sectional area of a hole is 725 cm². Given that the area of a circle is A= πr², find the radiusof that hole.
given the formula, A= πr², to find the radius, make r the subject of the equation. r = √(A/π) where we know π= 3.142 corrected to 3 decimal places, our radius r = √(725/3.142) = √230.745 = 15.190cm
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