Cho tứ giác ABCD có
và
. Khẳng định nào sau đây là sai ?
A.
![img1](https://cungthi.online/upload/questionbank3_20201220/eduquestion/20185721605111889640/obj20185721605111889640679180_images/obj20185721605111889640679180_img1.png)
B.
là hình thoi.
![img1](https://cungthi.online/upload/questionbank3_20201220/eduquestion/20185721605111889640/obj20185721605111889640995183_images/obj20185721605111889640995183_img1.png)
C.
![img1](https://cungthi.online/upload/questionbank3_20201220/eduquestion/20185721605111889640/obj20185721605111889640422297_images/obj20185721605111889640422297_img1.png)
D.
là hình thang cân.
![img1](https://cungthi.online/upload/questionbank3_20201220/eduquestion/20185721605111889640/obj20185721605111889640168349_images/obj20185721605111889640168349_img1.png)
Đáp án và lời giải
Đáp án:D
Lời giải:
![img1](https://cungthi.online/upload/questionbank3_20201220/eduquestion/20185721605111889640/obj20185721605111889640704372_images/obj20185721605111889640704372_img1.png)