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Find the circumferences of the circle with a diameter 2.1 cm

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7.2 cm

none of these

6.6 cm

5.3 cm

answer is B.

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Detailed Solution

The diameter of the circle is 2.1 cm.
Circumference of a circle = 2πr
Or circumference = πd
Circumference = π × 2.1 cm

$= \frac{22}{7} \times 2.1 c m = 22 \times 0.3 c m = 6.6 c m$

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