Cho hình chóp S.ABC có
và SA vuông góc với mặt phẳng (ABC). Tam giác ABC có
, góc
. Tính thể tích khối chóp đã cho.
A.A:
![img1](https://cungthi.online/upload/questionbank3_20201220/eduquestion/201718044994449599/obj201718044994449599260700_images/obj201718044994449599260700_img1.png)
B.B:
![img1](https://cungthi.online/upload/questionbank3_20201220/eduquestion/201718044994449599/obj201718044994449599722143_images/obj201718044994449599722143_img1.png)
C.C:
![img1](https://cungthi.online/upload/questionbank3_20201220/eduquestion/201718044994449599/obj201718044994449599149257_images/obj201718044994449599149257_img1.png)
D.D:
![img1](https://cungthi.online/upload/questionbank3_20201220/eduquestion/201718044994449599/obj201718044994449599291762_images/obj201718044994449599291762_img1.png)
Đáp án và lời giải
Đáp án:C
Lời giải:
Đáp án C
Ta có
Vậy
![img1](https://cungthi.online/upload/questionbank3_20201220/eduquestion/201718044994449599/obj201718044994449599654288_images/obj201718044994449599654288_img1.png)
![img2](https://cungthi.online/upload/questionbank3_20201220/eduquestion/201718044994449599/obj201718044994449599654288_images/obj201718044994449599654288_img2.png)
![img3](https://cungthi.online/upload/questionbank3_20201220/eduquestion/201718044994449599/obj201718044994449599654288_images/obj201718044994449599654288_img3.png)