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三个扇形的半径均为6cm，π取3.14，求图中阴影部分的面积．
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把半径分别为6cm8cm10cm的三个铁球熔成一个大铁球这个大铁球的半径为
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6cm
8cm
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如图所示分别以ABC为圆心在△ABC内作半径为2的三个扇形在△ABC内任取一点P如果点P落在这三个
三个圆的半径都是5cm三个圆两两相交于圆心求阴影部分的面积之和
29.25cm
2
33.25cm
2
35.35cm
2
39.25 cm
2
如图⊙A.⊙B.⊙C.两两不相交且半径都是2cm则图中三个扇形阴影部分的面积之和是____cm2.
如图⊙A⊙B⊙C的半径都是2cm则图中三个扇形即阴影部分面积之和是
2π
π
6π
三个圆的半径都是5cm三个圆两两相交于圆心求阴影部分的面积之和
29.25cm
2
33.25cm
2
39.25cm
2
35.35cm
2
如图⊙A⊙B⊙C两两不相交且半径都是2cm图中的三个扇形即三个阴影部分的面积之和是多少弧长的和为多
如图三个半径为1的等圆两两外切那么图中阴影部分的面积为__________.
三个圆的半径都是5cm三个圆两两相交于圆心求阴影部分的面积之和
29.25cm2
33.25cm2
39.25cm2
35.35cm2
如图⊙A⊙B⊙C两两不相交且半径都是0.5cm求图中的三个扇形即阴影部分的面积之和．友情提示三个圆心
已知扇形的圆心角为120°半径为6cm用这个扇形围成一个圆锥的侧面则此圆锥的底面半径为cm.
如图已知扇形AOB的圆心角为120°半径为6cm求扇形的弧长及所含弓形的面积.例4
三个圆的半径都是5cm三个圆两两相交于圆心求阴影部分的面积之和
29.25cm2
33.25cm2
39.25cm2
35.35cm2
如图半径为6cm的⊙O.中C.D.为直径AB的三等分点点E.F.分别在AB两侧的半圆上∠BCE=∠B
三个圆的半径都是5cm三个圆两两相交于圆心求阴影部分的面积之和
29.25cm
2
33.25cm
2
35.35cm
2
39.25cm
2
把一个半径为6cm的圆形硬纸片等分成三个扇形用其中一个扇形制作成一个圆锥形纸筒的侧面衔接处无缝隙且不
已知一个扇形的周长是6cm该扇形的中心角是1弧度求该扇形的面积.
已知扇形的圆心角为120º半径为6cm则扇形的弧长为cm.
小明想利用自家的一块圆形铁皮做一个圆锥形的漏斗但由于这块铁皮长时间浸泡在水中其中有一部分已经不能用了
把一个半径为6cm的圆形硬纸片等分成三个扇形用其中一个扇形制作成一个圆锥形纸筒的侧面衔接处无缝隙且不
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