the radius of a circle is 14 cm find the radius of a circle whose area is 4 times the area of the given circle. please answer digiya.
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3
Answer:
28cm
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Answer:
radius=14
area=π14×14
=22/7×14×14
=616
4times of area=4×616
=2464
2464=πR×R
R×R=2464×7/22
R×R=112×7
r=28
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