如图,连接CE、BE.由题意可知,BE=BC=CE=2,∴△BCE为等边三角形∴∠BCE=60°易得S△CBE=根号3 ;S扇形BCE=1/6×π×BC²=2/3π∴S弓形BE=S弓形CE=2/3π-根号3∴S阴影ABE=S扇形ABC-S扇形BCE- S弓形CE =1/4×π×BC²-2/3π - (2/3π-根号3) =π-2/3π - (2/3π-根号3)=根号3-1/3π∴S阴影=2 S阴影ABE=2(根号3-1/3π)=2根号3-2/3π
如图,连接CE、BE.由题意可知,BE=BC=CE=2,∴△BCE为等边三角形∴∠BCE=60°易得S△CBE=根号3 ;S扇形BCE=1/6×π×BC²=2/3π∴S弓形BE=S弓形CE=2/3π-根号3∴S阴影ABE=S扇形ABC-S扇形BCE- S弓形CE =1/4×π×BC²-2/3π - (2/3π-根号3) =π-2/3π - (2/3π-根号3)=根号3-1/3π∴S阴影=2 S阴影ABE=2(根号3-1/3π)=2根号3-2/3π