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.

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asked Jun 11, 2016 58.5k views

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Jonathan Magnan · Answer 1 · 2016-06-15T14:54:02+0000

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

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.

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