Cho khối chóp
có đáy
là tam giác đều cạnh
và hai mặt bên
,
cùng vuông góc với đáy. Tính thể tích khối chóp
biết
![img1](https://cungthi.online/upload/questionbank3/eduquestion/20194231755012504808/obj20194231755012504808940989_images/obj20194231755012504808940989_img1.png)
![img2](https://cungthi.online/upload/questionbank3/eduquestion/20194231755012504808/obj20194231755012504808940989_images/obj20194231755012504808940989_img2.png)
![img3](https://cungthi.online/upload/questionbank3/eduquestion/20194231755012504808/obj20194231755012504808940989_images/obj20194231755012504808940989_img3.png)
![img4](https://cungthi.online/upload/questionbank3/eduquestion/20194231755012504808/obj20194231755012504808940989_images/obj20194231755012504808940989_img4.png)
![img5](https://cungthi.online/upload/questionbank3/eduquestion/20194231755012504808/obj20194231755012504808940989_images/obj20194231755012504808940989_img5.png)
![img6](https://cungthi.online/upload/questionbank3/eduquestion/20194231755012504808/obj20194231755012504808940989_images/obj20194231755012504808940989_img6.png)
![img7](https://cungthi.online/upload/questionbank3/eduquestion/20194231755012504808/obj20194231755012504808940989_images/obj20194231755012504808940989_img7.png)
A.
B.
C.
D.
Đáp án và lời giải
Đáp án:B
Lời giải:
Phân tích: Ta có
. Cạnh
Vậy đáp án đúng là B.