A student measures the size of a circular zone of inhibition on an agar plate using a ruler. The left edge of the circular zone aligns with the 2.0 cm mark on the ruler, and the right edge aligns with the 10.0 cm mark.
What is the closest estimate of the area of this zone of inhibition?
(Use the formula: Area=πr2\text{Area} = \pi r^2Area=πr2 where π=3\pi = 3π=3)
24 cm224\text{ cm}^224 cm2
48 cm248\text{ cm}^248 cm2
75 cm275\text{ cm}^275 cm2
192 cm2192\text{ cm}^2192 cm2