helpppp
K
Khách
Hãy nhập câu hỏi của bạn vào đây, nếu là tài khoản VIP, bạn sẽ được ưu tiên trả lời.
![](https://rs.olm.vn/images/avt/0.png?1311)
Những câu hỏi liên quan
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
![](https://rs.olm.vn/images/avt/0.png?1311)
DT
Đỗ Thanh Hải
CTVVIP
9 tháng 3 2021
1 Preserving natural resources means reserving them for our future
2 In spite of the increase in air fares, most people still prefer to travel by plane
3 Regardless of your teaching method, the objective of any conversation class should be for student to practice spoken words
4 An injured man was taken to the hospital
5 In order for one to achive the desired results in this experiment, it is necessary that he work as fast as possible
![](https://rs.olm.vn/images/avt/0.png?1311)
DT
Đỗ Thanh Hải
CTVVIP
16 tháng 3 2021
III
1 putting
2 will push
3 doing
4 are being grown
5 to start
6 is
7 uses
8 to make
9 pulling
10 being grown
IV
1 was
2 born
3 in
4 from
5 be
6 age
7 to
8 By
9 was
10 prize
Lời giải:
Gọi $H$ là chân đường cao kẻ từ $A$ xuống $BC$. Vì $ABC$ cân tại $A$ nên $H$ là trung điểm của $BC$
$\Rightarrow HB=BC:2=3$ (cm)
Áp dụng định lý Pitago: $AH=\sqrt{AB^2-HB^2}=\sqrt{5^2-3^2}=4$ (cm)
Diện tích đáy: $S_{ABC}=\frac{AH.BC}{2}=\frac{4.6}{2}=12$ (cm2)
Thể tích: $AA'.S_{ABC}=9.12=108$ (cm3)
Diện tích xung quanh: $P_{ABC}.AA'=(AB+BC+AC).AA'=(5+5+6).9=144$ (cm2)
Diện tích toàn phần: $144+2\times 12=168$ (cm2)