Question

点c在线段AB的延长线上一点,点M是线段AC的中点,,点N是线段BC的中点。若A

点c在线段AB的延长线上一点,点M是线段AC的中点,,点N是线段BC的中点。若AB=10cm，求MN的长。

Answer 1

MN=AN-AM
=(AB+BC/2)-(AB+BC)/2
=AB+BC/2-AB/2-BC/2
=AB/2
=10/2
=5