Question 552120
a wheel has a 20-inch diameter.in terms of pi, how far it will roll if it turns 270 degrees? 
i tried to solve this by using a simple area of sector formula. and i got an answer 15 pi. but i am worried on my answer since the question is new to me and i used a common formula. was my answer right? i need an explanation or other answers.
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Each revolution is 20*pi inches
270 degs is 3/4 of a rev, = 15*pi inches.