Cho hình chóp
có
,
,
đôi một vuông góc và
. Gọi
,
lần lượt là hình chiếu vuông góc của
trên
,
. Tính thể tích hình chóp
.
![img1](https://cungthi.online/upload/questionbank3_20201220/eduquestion/2017150884312899408/obj2017150884312899408995390_images/obj2017150884312899408995390_img1.png)
![img2](https://cungthi.online/upload/questionbank3_20201220/eduquestion/2017150884312899408/obj2017150884312899408995390_images/obj2017150884312899408995390_img2.png)
![img3](https://cungthi.online/upload/questionbank3_20201220/eduquestion/2017150884312899408/obj2017150884312899408995390_images/obj2017150884312899408995390_img3.png)
![img4](https://cungthi.online/upload/questionbank3_20201220/eduquestion/2017150884312899408/obj2017150884312899408995390_images/obj2017150884312899408995390_img4.png)
![img5](https://cungthi.online/upload/questionbank3_20201220/eduquestion/2017150884312899408/obj2017150884312899408995390_images/obj2017150884312899408995390_img5.png)
![img6](https://cungthi.online/upload/questionbank3_20201220/eduquestion/2017150884312899408/obj2017150884312899408995390_images/obj2017150884312899408995390_img6.png)
![img7](https://cungthi.online/upload/questionbank3_20201220/eduquestion/2017150884312899408/obj2017150884312899408995390_images/obj2017150884312899408995390_img7.png)
![img8](https://cungthi.online/upload/questionbank3_20201220/eduquestion/2017150884312899408/obj2017150884312899408995390_images/obj2017150884312899408995390_img8.png)
![img9](https://cungthi.online/upload/questionbank3_20201220/eduquestion/2017150884312899408/obj2017150884312899408995390_images/obj2017150884312899408995390_img9.png)
![img10](https://cungthi.online/upload/questionbank3_20201220/eduquestion/2017150884312899408/obj2017150884312899408995390_images/obj2017150884312899408995390_img10.png)
![img11](https://cungthi.online/upload/questionbank3_20201220/eduquestion/2017150884312899408/obj2017150884312899408995390_images/obj2017150884312899408995390_img11.png)
A.
B.
C.
D.
Đáp án và lời giải
Đáp án:D
Lời giải:
Ta có vuông cân tại
,
là đường cao
cũng là trung tuyến
Tương tự
Vậy đáp án đúng là: D.