篮球场和足球场有许多圆形和半圆形,它们分别是什么区域,和足球场篮球场的周长,面积 在篮球场足球场上,有许多圆形和半圆形。他们是什么区域?周长和...

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篮球场:中间圆形“中圈”;罚球区半圆“罚球半圆”;大半圆“三分投篮区”;最小半圆“无撞人半圆区”,周长86米,面积420平米。
通用足球场:中间圆“中圈弧”,禁区半圆“罚球弧”,周长346米,面积7140平米。

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