周测培优卷8 圆的面积
周测培优卷8圆的面积一、填空。(13分)1.圆的直径是6厘米,它的半径是( )厘米,周长是( )厘米,面积是( )平方厘米。2.一个半径为4厘米的圆,把它平均分成若干个小扇形后,可以拼成一个近似的长方形,这个长方形的长是( )厘米,宽是()厘米。3.一个圆形花坛的周长是50.24米,它的直径是( )米,面积是()平方米。4.在一个长6厘米,宽4厘米的长方形内画一个最大的圆,这个圆的周长是( )厘米,面积是( )平方厘米。5.一个圆的半径扩大到原来的3倍,它的直径扩大到原来的( )倍,周长扩大到原来的( )倍,面积扩大到原来的( )倍。6.大圆半径是小圆半径的2倍,大圆面积比小...
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