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cycle exam

圓周率是圓周長與什麼的比率? 直徑
圓面積公式是半徑乘以半徑乘以什麼? 圓周率
有一圓的半徑是4公分,請問它的面積是多少? 50.24平方公分
有一圓的直徑是40公分,請問它的面積是多少? 400π平方公分
圓的構成要素有直徑、半徑、圓周和什麼? 圓心
Created by: CPMA