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28 December, 16:20

A circle has an area of 12. If the radius is increased by a factor of 2, what is the new area of the circle?

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  1. 28 December, 19:55
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    A=12. A=π*r^2 (area of a circle)

    π*r^2=12

    r*2:

    π * (r*2) ^2 = π*r^2*4. Here you can see that the calculation is exactly the same as above except from the Factor 4. This Shows that the area is four times bigger than before: 12*4
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