One circle has a diameter of 6 inches. A second, larger circle has a diameter that is four times the diameter of the first circle. What is the ratio of the area of the smaller circle to the larger circle?

A 2:3
B 1:6.4
C 1:16
D 1:64

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Answer:

Step-by-step explanation:

d₁ = 6 inches

r₁ = 3 inches

area = Ļ€r₁² = 9Ļ€ in²

dā‚‚ = 24 inches

rā‚‚ = 12 inches

area = Ļ€r₂² = 144Ļ€ in²

ratio of areas = (9Ļ€)/(144Ļ€) = 9/144 = 1/16