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[–] 14 points 2 years ago (1 child)

You can compare areas with just r^2 you don't even need pi. So the math is easy.

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  • [–] 4 points 2 years ago

    A pizza is larger than two of another just before it hits 1.5 times the radius (sqrt 2 times, to be exact, about 1.41). So if the radius is 1.5 times bigger, like in the OP, you always know it's more than twice the area.

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