If the diameter of a circle changes from 18 cm to 6 cm, how will the circumference change? A) multiplies by 1/3 B) multiplies by 3 C) increases by 10 D) decreases by 10

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asked Dec 2, 2019 183k views

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Bogdan Zurac · Answer 1 · 2019-12-07T11:12:02+0000

we know that

the length of a circumference=2*pi*r
for D1=18 cm--------------> r1=9cm
L1=2pi*9-------> 18pi cm

for D2=6 cm-----------> r2=3 cm
L2=2pi*3-------> 6pi cm

L2/L1----------> (6pi)/(18pi)---->1/3

the answer is the option A) multiplies by 1/3

If the diameter of a circle changes from 18 cm to 6 cm, how will the circumference change? A) multiplies by 1/3 B) multiplies by 3 C) increases by 10 D) decreases by 10

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