Antibiotics can be tested on bacteria growing on a Petri dish.
The clear area around an antibiotic disc gives information about how effective the antibiotic is.
What is the closest estimate of the clear area on this Petri dish?
(Include the disc and use the formula: Area=πr2\text{Area} = \pi r^2Area=πr2 where π=3\pi = 3π=3)
9 cm29\text{ cm}^29 cm2
18 cm218\text{ cm}^218 cm2
27 cm227\text{ cm}^227 cm2
54 cm254\text{ cm}^254 cm2