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HUN PEK
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Pham Trong Bach
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Cao Minh Tâm
29 tháng 4 2018 lúc 8:47

Giải sách bài tập Toán 8 | Giải bài tập Sách bài tập Toán 8

Vì ΔABC vuông cân tại A nên Giải sách bài tập Toán 8 | Giải bài tập Sách bài tập Toán 8

Lại có: Giải sách bài tập Toán 8 | Giải bài tập Sách bài tập Toán 8 ( tính chất tam giác vuông).

Suy ra: ∠ C 1 = 45 0

Vì ∆ BCD vuông cân tại B nên Giải sách bài tập Toán 8 | Giải bài tập Sách bài tập Toán 8

Lại có: Giải sách bài tập Toán 8 | Giải bài tập Sách bài tập Toán 8 ( tính chất tam giác vuông).

Suy ra:  ∠ C 2 45 0

∠ (ACD) = ∠ C 1 +  ∠ C 2 =  45 0  +  45 0  =  90 0

⇒ AC ⊥ CD

Mà AC ⊥ AB (gt)

Suy ra: AB //CD

Vậy tứ giác ABCD là hình thang vuông.

Mai Linh Đào Nguyễn
10 tháng 1 2023 lúc 22:47

SBT TRAG BAO NHIÊU Ạ

 

Anh Thu
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Nguyễn Lê Phước Thịnh
2 tháng 9 2023 lúc 14:55

ΔBDC vuông cân tại B

=>góc BCD=góc BDC=45 độ

ΔABC vuông cân tại A

=>góc ABC=góc ACB=45 độ

góc ABC=góc DCB

mà hai góc này ở vị trí so le trong

nên AB//DC

mà AB vuông góc AC

nên DC vuông góc AC

Xét tứ giác ABDC có

AB//DC
góc CAB=90 độ

Do đó: ABDC là hình thang vuông

Thư Anh Nguyễn
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5g lớp
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Nguyễn Lê Phước Thịnh
6 tháng 3 2023 lúc 11:05

a: Xét ΔABC có BC^2=AB^2+AC^2

nên ΔABC vuông tại A

Xét ΔABD vuông tại D và ΔCAD vuông tại  D có

góc DBA=góc DAC

=>ΔABD đồng dạng với ΔCAD

b: góc EAF+góc EDF=180 độ

=>AFDE nội tiếp

=>góc AFD+góc AED=180 độ

=>góc AFD=góc CED

Sách Giáo Khoa
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Dũng Nguyễn
1 tháng 9 2018 lúc 20:33

Hình thang

Vì ∆ ABC vuông cân tại A nên \(\widehat{C_1}=45^o\)

Vì ∆ BCD vuông cân tại B nên \(\widehat{C_2}=45^o\)

\(\Rightarrow\widehat{ACD}=\widehat{C_1}+\widehat{C_2}=45^o+45^o=90^o\)

\(\Rightarrow\) AC ⊥ CD, AC ⊥ AB (gt)

Suy ra: AB // CD. Vậy tứ giác ABDC là hình thang vuông.

Nguyen Thuy Hoa
29 tháng 6 2017 lúc 11:55

Hình thang

Đông Nguyễn
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Đức Lê Anh
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Vũ Hồng Nhung
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Hoàng Trang
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Cao Linh Chi
13 tháng 2 2016 lúc 11:30

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CUTE vô đối
7 tháng 3 2017 lúc 20:37

CCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCGCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCC

cô nàng bạch dương
18 tháng 3 2017 lúc 12:04

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