diameter : side = 20:24 = 10:12.
Circle:
If d=10, then r=5.
Area = πr² = 25π ≈ 75.
Square:
If s=12, then A = s² = 12² = 144.
Circle/square ≈ 75/144.
Since 75/150 = 1/2, 75/144 is just a bit more than 1/2.
The correct answer is
C.
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