佇歐幾里得(Eukleides)幾何,圓形(Înn-hîng)是離一个點(圓心)平平遠(半徑)所有的點,圓共平面切做圓內底佮圓外口二部份,圓的面積就是比圓內底的面積,大細是圓徑率π乘半徑r的平方,徛π r²,直徑是通過圓心,二个端顛攏佇圓頂懸的線橛,長度是半徑的二倍,圓徑是圓的長度,就是直徑d乘圓徑率 π,徛π d,抑2 π r

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