如图,四边形ABCD是菱形,对角线AC与BD相交于O,AB=5,AO=4,求BD的长.

问题描述:

如图,四边形ABCD是菱形,对角线AC与BD相交于O,AB=5,AO=4,求BD的长.

∵四边形ABCD是菱形,对角线AC与BD相交于O,
∴AC⊥BD,DO=BO,
∵AB=5,AO=4,
∴BO=

5242
=3,
∴BD=2BO=2×3=6.