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प्रश्न
If the radius of a circle is doubled, its area becomes ____________.
विकल्प
2 times
4 times
8 times
16 times
MCQ
रिक्त स्थान भरें
उत्तर
If the radius of a circle is doubled, its area becomes 4 times.
Explanation:
original area = `pi "r"^2`
when the radius is doubled
New area = `pi (2 "x")^2`
`= 4 xx pi "x"^2`
area will increase 4 times.
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