The centre point of a circle is at 15 cm distance from circumference of the circle. What is length of diameter of the circle?

15 cm

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30 cm

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7.5 cm

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35 cm

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Solution

The correct option is B 30 cm
$\to$ Radius of circle is distance between the centre point and circumference of a circle.
Hence, Radius of circle $= 15$ cm
Let's draw a circle of given radius.

Radius = AC = BC = 15cm

$\to$ Diameter of a circle is twice the radius of the circle.
Hence, Diameter $= 2 \times$ radius
Diameter = AB $= 2 \times 15 = 30$ cm

Option (b) is correct.

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