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)
Giáo án công ngh 8ệ
I. M c tiêu:ụ
1. Ki n thế cứ Nh n bi t các kh i đa đi n th ng g p: hình h p, hình chóp đ u, hình lăng trậ ế ố ệ ườ ặ ộ ề ụ
đ u.ề
2. K năngỹ : Đ c đ c b n v v t th có d ng hình h p ch nh t, hình chóp đ u, hình lăng trọ ượ ả ẽ ậ ể ạ ộ ữ ậ ề ụ
đ u.ề
3.Thái độ : Tìm tòi, khám phá.
II. Chu n bẩ ị :
1. G V: Mô hình các kh i đa đi n, b n v 4.2, 4.5, 4.7.ố ệ ả ẽ
2. HS: N i dung bài h cộ ọ .
III. T ch c ho t đ ng d y ổ ứ ạ ộ ạ và h c:ọ
1. Ổ n đ nh l p:ị ớ (1 phút).
8A1:…………………………………………………..
8A2:…………………………………………………..
2. Ki m tra bài cũ:ể (5 phút)
- Nêu khái ni m v hình chi u?ệ ề ế
- Nêu tên các hình chi u và v trí c a chúng trên b n v kĩ thu t?ế ị ủ ả ẽ ậ
3. Đ t v n đ : ặ ấ ề (1 phút) - Trên th c t v t đ c k t c u b i ba chi u và d ng kh i. Nh v y đự ế ậ ượ ế ấ ở ề ạ ố ư ậ ể
th hi n hình chi u c a v t th trên b n v chúng ta th hi n hình chi u c a các kh i t o nênể ệ ế ủ ậ ể ả ẽ ể ệ ế ủ ố ạ
v t th đó.ậ ể
4. Ti n trình:ế
HO T Đ NG C A HSẠ Ộ Ủ TR GIÚP C A GVỢ Ủ
Ho t đ ngạ ộ 1: Tìm hi u các kh i đa di nể ố ệ : (5 phút)
- Tìm hi u kh i đa di n.ể ố ệ
- B i các đa giác ph ng.ở ẳ
- H ng d n HS tìm hi u kh i đa di n thôngướ ẫ ể ố ệ
qua v t th hình 4.1?ậ ể
+ Kh i đa di n đ c gi i h n b i các hìnhố ệ ượ ớ ạ ở
gì?
Ho t đ ngạ ộ 2: Tìm hi u hình h p ch nh t: (10 phút)ể ộ ữ ậ
- Hình ch nh t.ữ ậ
- 3 kích th c: DxRxCướ
- Đ u là hình ch nh t.ề ữ ậ
+Hình h p ch nh t đ c gi i h n b i cácộ ữ ậ ượ ớ ạ ở
hình gì?
+ Hình h p ch nh t có m y kích th c?ộ ữ ậ ấ ướ
+ Các hình chi u là các hình gì?ế
Đ bi u di n hình h p ch nh t thì c nể ể ễ ộ ữ ậ ầ
Bài 4:
B N V KH I ĐA ĐI NẢ Ẽ Ố Ệ