小圆面积是12÷(2×2-1)=4平方米回答完毕~有疑问请追问,我一定尽快回复你~无疑问请点击【采纳】,同时预祝学习进步~\(^o^)/~我不是学霸,叫我赌神~\(^o^)/~~\(^o^)/~~\(^o^)/~~\(^o^)/~