30. If radius of a circle is increased to twice its original length, how
much will the area of the circle increase?
Answers
Answered by
2
Answer:
It will increase by 4 times
Step-by-step explanation:
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Answered by
3
Answer:
4 times
Step-by-step explanation:
suppose originally, it is 7cm
Area = pi r ^2
= 22/7 * 49
= 154cm^2
after doubling
Radius = 14cm
area = pir^2
= 22/7* 196
= 616cm^2
154cm : 616cm
= 1:4
Thus, it is four times the old radius
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