The formula used to measure the circumference of a circle is

0.132 km

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$π r$

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$π d$

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$2 π d$

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Solution

The correct options are
A
0.132 km

C
$π d$

The circumference of a circle

$= 2. π . r = π . d$

where r is the radius of the circle and d is the diameter of a circle.

Options (a) and (c) both are correct here since d = 2r.

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