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

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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