![](https://static.youtibao.com/asksite/comm/h5/images/m_q_title.png)
[单选题]
如图,D,E,F△ABC的边AB,BC,AC的中点,若△ABC的面积为16,则三角形△DEF的面积是()
A.16
B.12
C.8
D.4
![](https://static.youtibao.com/asksite/comm/h5/images/m_q_a.png)
D、4
![](https://static.youtibao.com/asksite/comm/h5/images/solist_ts.png)
A.16
B.12
C.8
D.4
D、4
A.30°
B.40°
C.50°
D.60°
如图,在△ABC中,AB=AC,以AB为直径的半圆O交BC于点D,交AC于点E,点D为CE的中点,连结DF,DE,AD。(1)求证:CD=DE。(2)若OA=5。sin∠CAB=4/5,求DF的长。
A.∠BCB′=∠ACA′
B.∠ACB=2∠B
C.∠B′CA=∠B′AC
D.′C平分∠BB′A′