Question

If radius of a circle is halved then,

• A. the diameter will be doubled
• B. the diameter will be halved
• C. the diameter will be tripled
• D. the diameter will be same

Answer 1

The correct option is B

the diameter will be halved

If the diameter of a circle is doubled, then its radius is also doubled.

Eg: If diameter of a circle is 6 cm, then radius $=\frac{6}{2}=3$ cm
If the diameter is doubled, i.e., diameter $=2\times 6=12$ cm,
then radius is $\frac{12}{2}=6$ cm
Hence, the radius is also doubled.

So if the radius is halved, diameter is also halved.