# math

On My scooter, the rear wheel's diameter is 6 cm more than the front wheel's. The rear wheel's circumference is ___ cm more than the front wheel's.

A) 3π B) 6π C) 9π D) 36 π

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1. π(d+6) = πd + 6π

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2. front wheel's circumference = d π

rear wheel's circumference = ( d + 6 ) π

( d + 6 ) π - d π =

π ∙ d + π ∙ 6 - d π =

d ∙ π + 6 ∙ π - d π =

d π - d π + 6 ∙ π = 6 π

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3. thx

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