If diameter of a circle is doubled, then

Radius will be doubled

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Radius will decrease

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Radius will remain same

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Radius will be halved

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Solution

The correct option is A Radius will be doubled
If the diameter of a circle is doubled, then its radius is also doubled.
Eg. If diameter of a circle ie 6 cm then radius $= \frac{6}{2} = 3$ cm
If the diameter is doubled i.e. if diameter $= 2 \times 6 = 12$ cm
then radius is $\frac{12}{2} = 6$ cm
Hence the radius is also doubled.

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If diameter of a circle is doubled, then

The correct option is A Radius will be doubledIf the diameter of a circle is doubled, then its radius is also doubled. Eg. If diameter of a circle ie 6 cm then radius =62=3 cm If the diameter is doubled i.e. if diameter =2×6=12 cm then radius is 122=6 cm Hence the radius is also doubled.