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.
答
∵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=
=3,
52−42
∴BD=2BO=2×3=6.