如图,已知AB∥CD,AD与BC相交于点P,AB=4,CD=7,AD=10,则AP=(  ) A.4011 B.407 C.7011 D.704

问题描述:

如图,已知AB∥CD,AD与BC相交于点P,AB=4,CD=7,AD=10,则AP=(  )
A.

40
11

B.
40
7

C.
70
11

D.
70
4

∵AB∥CD,

∠A=∠D
∠B=∠C
,△APB∽△DPC,
∴AB:CD=AP:DP=AP:(AD-AP),
即4:7=AP:(10-AP),
∴AP=
40
11

故选A.