SOLUTION: A car has two different sized disc brake rotors. The front brakes have a diameter of 35 cm and the rear brakes have a diameter of 27 cm. How much larger is the area of a front brak

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Question 211807: A car has two different sized disc brake rotors. The front brakes have a diameter of 35 cm and the rear brakes have a diameter of 27 cm. How much larger is the area of a front brake rotor compared to a rear brake rotor? Round answers to the nearest tenth.
Answer by rfer(16322) About Me  (Show Source):
You can put this solution on YOUR website!
a=pir^2
a=3.14(17.5)^2
a=3.14(306.25)
a=961.63 sq cm
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a=3.14(13.5)^2
a=3.14(182.25)
a=572.65 sq cm
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961.63-572.65=389 sq cm