问题
填空题
线段AB与CD交于点O,若AB=3AO,则当CO:DO的值为______时,线段AC∥BD.
答案
∵AC∥BD∴∠OBD=∠OAC,
∵∠AOC=∠BOD,∴△AOC∽△BOD,
∴
=AO BO
,CO DO
∵AB=3AO,
∴
=CO DO
.1 2
故答案为
.1 2
线段AB与CD交于点O,若AB=3AO,则当CO:DO的值为______时,线段AC∥BD.
∵AC∥BD∴∠OBD=∠OAC,
∵∠AOC=∠BOD,∴△AOC∽△BOD,
∴
=AO BO
,CO DO
∵AB=3AO,
∴
=CO DO
.1 2
故答案为
.1 2