maths--area

2007-07-31 3:17 am

1) the radius of a wheel is 20cm. how far does it travel in 500 revolutions?(express your answer in terms of π.)

回答 (3)

2007-07-31 3:22 am

✔ 最佳答案

The circumference
=2π20
=40π cm

The distance
=40π*500
=20000π cm

參考: 自己

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2007-07-31 3:45 am

because circumference of a circle =2πr (r=radius)
so,
distance of the wheel travel 500 revolutions=500*2πr
=500*2*20cm*π
=20000π cm.

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2007-07-31 3:30 am

the distance it travels=2π(20cm)(500)=20000π cm=200π m=0.2π km

希望幫到你

參考: own

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