有下列命题:\(①\)两个相等向量,它们的起点相同,终点也相同;\(②\)若\(\left| \overset{⇀}{a}\right|=\left| \overset{⇀}{b}\right| \),则\( \overset{→}{a}= \overset{→}{b} \);\(③\)若\(\left| \overset{⇀}{AB}\right|=\left| \overset{⇀}{DC}\right| \),则四边形\(ABCD\)是平行四边形;\(④\)若\( \overset{⇀}{m}= \overset{⇀}{n} \),\( \overset{⇀}{n}= \overset{⇀}{k} \),则\( \overset{⇀}{m}= \overset{⇀}{k} \);\(⑤\)若\( \overset{⇀}{a}/\!/ \overset{⇀}{b} \),\( \overset{⇀}{b}/\!/ \overset{⇀}{c} \),则\( \overset{⇀}{a}/\!/ \overset{⇀}{c} \);\(⑥\)有向线段就是向量,向量就是有向线段。其中,假命题的个数是 \((\) \()\)