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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.

Sagot :

princestien
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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