The diameter of a circle whose radius $5$ cm is:

10

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10

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20

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5

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Solution

The correct option is A $10$ cm
In figure $O B$ is the radius of a circle.
Give, $O B = 5 c m$ .
We know, the diameter of a circle is double its radius.
Here, $A B$ is the diameter.
Therefore, $A B = 2 O B = 2 \times 5$ .
$⟹$ $A B = 10 c m$

Hence, option $A$ is correct.

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