If radius of a circle is increased to twice its original length, how much will the area of the circle increase ?
Answer: 4 times
Explanation
Let r be the radii of a circle.
Then, area of circle =πr 2
If radii are doubled, than radii become 2r.
Now, area of circle =π(2r) 2
=4π. Therefore, the area of circle is increased by 4 times.
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