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直径70厘米的树周长多少
更新时间： 2020-09-21 00:00:00  

树的横截面是一个圆形，圆形周长C=2πr = πd（r为半径，d为直径）。

树的直径为70厘米，周长C=70×π，

π取两位小数3、14,

周长C = 70×3、14=219、8厘米。

关键词： 直径 厘米 周长 多少

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