如图,在中,
,
,
,点D为
的中点,若直角
绕点D旋转,分别交
于点E,交
于点F,则下列说法:①
;②
;③
;④若
的面积为一个定值,则
的长也是一个定值.其中正确的有
更新时间:2024-04-01 15:35:09
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