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20-05-2016
Mathematics

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When the radius doubles, does the area of the circle double?

A) 4π cm2; 8π cm2; NO
B) 4π cm2; 16π cm2; NO
C) 4π cm2; 16π cm2; YES
D) 4π cm2; 8π cm2; YES

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20-05-2016

example
from pir^2 ro pi(2r)^2
pi(2r)^2=pi4r^2=4pir^2

basicaly we look for any no options and ones where second is 4 times first

B

pi2^2, if it is double, pi4^2

B

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