Cho lăng trụ đứng
có đáy
là tam giác vuông tại
;
;
. Biết cạnh bên của lăng trụ bằng
. Thể tích khối lăng trụ là:
A.
.
![img1](https://cungthi.online/upload/questionbank3_20201220/eduquestion/2019443176238206933/obj2019443176238206933727082_images/obj2019443176238206933727082_img1.png)
B.
![img1](https://cungthi.online/upload/questionbank3_20201220/eduquestion/2019443176238206933/obj2019443176238206933724147_images/obj2019443176238206933724147_img1.png)
C.
![img1](https://cungthi.online/upload/questionbank3_20201220/eduquestion/2019443176238206933/obj2019443176238206933547715_images/obj2019443176238206933547715_img1.png)
D.
![img1](https://cungthi.online/upload/questionbank3_20201220/eduquestion/2019443176238206933/obj2019443176238206933120269_images/obj2019443176238206933120269_img1.png)
Đáp án và lời giải
Đáp án:C
Lời giải:Phân tích:
Tam giác
vuông tại
có
;
.
Hình lăng trụ có chiều cao
, diện tích đáy:
.
Thể tích khối lăng trụ là:
.
![img1](https://cungthi.online/upload/questionbank3_20201220/eduquestion/2019443176238206933/obj2019443176238206933752274_images/obj2019443176238206933752274_img1.png)
![img2](https://cungthi.online/upload/questionbank3_20201220/eduquestion/2019443176238206933/obj2019443176238206933752274_images/obj2019443176238206933752274_img2.png)
![img3](https://cungthi.online/upload/questionbank3_20201220/eduquestion/2019443176238206933/obj2019443176238206933752274_images/obj2019443176238206933752274_img3.png)
![img4](https://cungthi.online/upload/questionbank3_20201220/eduquestion/2019443176238206933/obj2019443176238206933752274_images/obj2019443176238206933752274_img4.png)
![img5](https://cungthi.online/upload/questionbank3_20201220/eduquestion/2019443176238206933/obj2019443176238206933752274_images/obj2019443176238206933752274_img5.png)
![img6](https://cungthi.online/upload/questionbank3_20201220/eduquestion/2019443176238206933/obj2019443176238206933752274_images/obj2019443176238206933752274_img6.png)
![img7](https://cungthi.online/upload/questionbank3_20201220/eduquestion/2019443176238206933/obj2019443176238206933752274_images/obj2019443176238206933752274_img7.png)
![img8](https://cungthi.online/upload/questionbank3_20201220/eduquestion/2019443176238206933/obj2019443176238206933752274_images/obj2019443176238206933752274_img8.png)