Cho hình chóp S.ABCD có ABCD là hình thoi cạnh a,
và SA vuông góc với đáy (ABCD). Thể tích V của khối chóp S.ABCD bằng:
A.A.
![img1](https://cungthi.online/upload/questionbank3_20201220/eduquestion/201749066430704244/obj201749066430704244243198_images/obj201749066430704244243198_img1.png)
B.B.
![img1](https://cungthi.online/upload/questionbank3_20201220/eduquestion/201749066430704244/obj201749066430704244224801_images/obj201749066430704244224801_img1.png)
C.C.
![img1](https://cungthi.online/upload/questionbank3_20201220/eduquestion/201749066430704244/obj201749066430704244540804_images/obj201749066430704244540804_img1.png)
D.D.
![img1](https://cungthi.online/upload/questionbank3_20201220/eduquestion/201749066430704244/obj201749066430704244141415_images/obj201749066430704244141415_img1.png)
Đáp án và lời giải
Đáp án:B
Lời giải:VSABC=1/3. Sđáy.h(chiều cao)=1/3.SA.SABCD
SABCD=2SABC=2.a2.
/4=
a2/2
Vậy VSABC=1/3.a
.
a2/2=
Đáp án B
![img1](https://cungthi.online/upload/questionbank3_20201220/eduquestion/201749066430704244/obj201749066430704244252928_images/obj201749066430704244252928_img1.png)
![img2](https://cungthi.online/upload/questionbank3_20201220/eduquestion/201749066430704244/obj201749066430704244252928_images/obj201749066430704244252928_img2.png)
![img3](https://cungthi.online/upload/questionbank3_20201220/eduquestion/201749066430704244/obj201749066430704244252928_images/obj201749066430704244252928_img3.png)
![img4](https://cungthi.online/upload/questionbank3_20201220/eduquestion/201749066430704244/obj201749066430704244252928_images/obj201749066430704244252928_img4.png)
![img5](https://cungthi.online/upload/questionbank3_20201220/eduquestion/201749066430704244/obj201749066430704244252928_images/obj201749066430704244252928_img5.png)