Cho tam giác ABC cân tại A, D thuộc cạnh BC. Qua D vẽ (O

TH

Thanh Huyền Trần Thị

1 tháng 7 2020 - olm

Cho tam giác ABC cân tại A, D thuộc cạnh BC. Qua D vẽ (O;R) tiếp xúc với AB tại B, (O';R') tiếp xúc với AC tại C. K là giao điểm thứ hai của hai đường tròn này.

a) Chứng minh tứ giác ABKC nội tiếp.

b) Chứng minh A, D, K thẳng hàng và AD.AK không đổi.

#Toán lớp 9

0

LC

Linh Chây Nguyễn

25 tháng 8 2021

Cho điểm O nằm trong tam giác đều ABC cạnh a. Qua O vẻ các đường thẳng DE//BC (D thuộc AB; E thuộc AC); MN//AC (M thuộc BC; N thuộc AB); PQ//AB (P thuộc AC; Q thuộc BC)a) Chứng minh tứ giác DEBC là hình thang cân và tam giác OMD đềub) Vẽ OH,OI,OK lần luợt vuông góc với AB,BC,ACChứng minh AH + BI+ CK=1.5 e cần gấp mn giúp e , hứa tick...

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#Toán lớp 8

0

T

thanh

8 tháng 9 2021

Cho tam giác ABC vuông cân tại A, D thuộc AB, E thuộc AC sao cho AD=AE. Qua D vẽ đoạn thẳng vuông góc BE cắt BC tại K. Qua A vẽ đoạn thẳng vuông góc BE cắt BC tại H. Gọi M là giao điểm của DK và AC. CMR:

a) tam giác BAE = tam giác CAD (cái này mình biết làm rồi)

b) tam giác MDC cân

c) HK = HC

#Toán lớp 8

0

BC

Bảo Chi

20 tháng 2 2020 - olm

Cho tam giác ABC vuông tại A có góc B = 60 độa)Tính số đo góc C và so sánh độ dài 3 cạnh của tam giác ABC.b)Vẽ BD là tia phân giác của góc ABC (D thuộc AC). Qua D vẽ DK vuông góc với BC (K thuộc BC). Chứng minh tam giác BAD=tam giác BKD.c)Chứng minh tam giác BDC cân và K là trung điểm BC.d)Tia KD cắt BA tại I. Tính độ dài cạnh ID biết AB=3cm (làm tròn kết quả đến chữ số thập phân thứ...

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#Toán lớp 7

1

BC

Bảo Chi

20 tháng 2 2020

GIÚP MÌNH VỚI CÁC BẠN ƠI!!!

ARIGATO!!!

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NT

nguyễn thị thu trang

16 tháng 2 2020 - olm

cho tam giác ABC vuông cân tại A. Qua A vẽ đường thẳng d sao cho B và C cùng thuộc 1 nửa mặt phẳng bờ d. Vẽ BD vuông góc d tại D, CE vuông góc d tại E a) CM DE=BD+ CE, BD2+ CE2= AB B) Gouj M là trung điểm cạnh BC. CM tam giác DME là tam giác vuông cân

#Toán lớp 7

3

DD

✫¸.•°*”˜˜”*°•✫ Ṱђầภ Ḉђết ✫•°*”˜˜”*°...

16 tháng 2 2020

Tham khảo ở đây nha

https://olm.vn/hoi-dap/detail/12435070952.html

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DD

✫¸.•°*”˜˜”*°•✫ Ṱђầภ Ḉђết ✫•°*”˜˜”*°...

21 tháng 2 2020

Tham khảo ở đây nha

Câu hỏi của Phạm Hương Giang - Toán lớp 7 - Học toán với OnlineMath

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CV

Cuong Vuduy

9 tháng 4 2019 - olm

cho tam giác abc cân tại a(góc a<90) vẽ tia phân giác ad của góc a(d thuộc bc) chứng minh tam giác abd= tam giác acd vẽ dường trung tuyến cf của tam giác abc cắt ad tại g chứng minh g là trọng tâm của tam giác abc gọi h là trung điểm của cạnh dc qua h vẽ đường thẳng vuông góc với cạnh dc cắt cạnh ac tại e chứng minh tam giác dec cân chứng minh ba điểm b,g,e thẳng hàng

#Toán lớp 7

0

HL

Hoàng Linh

17 tháng 2 2022

Cho tam giác ABC cân tại A , D là 1 điểm thuộc cạnh BC, qua D vẽ đường tròn ( O,R) tiếp xúc với AB tại B VÀ (O';R;) tiếp xúc với AC tại C , K là giao điểm thứ 2 của 2 đường tròn này a) CM: tg ABKC nội tiếp b) A,K,D thẳng hàngc) độ dài 2 đường thẳng ko phụ thuộc vào vị trí điểm D mọi người giúp mình với mình cần gấp...

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#Toán lớp 9

0

LM

Lê Mai

5 tháng 4 2018 - olm

Cho tam giác ABC cân tại A nội tieeop đường tròn (O). từ M trên cạnh BC vẽ các đường thẳng song song các cạnh bên tam giác ABC cắt AB, AC tại P và Q. gọi D là điểm đối xứng của M qua PQ

a) Cm: góc ACD=ODC

b) Cm: tam giác APD = DQA

c) chứng minh A, B,C,D cùng thuộc một đường tròn

#Toán lớp 9

0

DT

Đinh Thị Ngọc Anh

22 tháng 10 2016 - olm

Cho tam giác ABC vuông cân tại A. Vẽ AH _|_ BC. D thuộc đoạn HC. Vẽ hình chữ nhật AHDO.Vẽ (O;OD) cắt tia đối của tia AB tại E, cắt cạnh AC tại F. Chứng minh AE=AF

#Toán lớp 9

0

HT

Hoàng Trang

20 tháng 7 2015 - olm

1. Cho tam giác ABC vuông ở A có AB<AC. AH vuông góc với BC tại H, D là điểm trên cạnh BC sao cho AD=AB. Vẽ DE vuông góc với BC tại E. Chứng mih rằng AH=HE.

2. Cho tam giác ABC vuông cân tại A.. Qua A vẽ đường thẳng d ở ngoài tam giác ABC . Vẽ BD vuông góc với d taị D. CE vuông góc với d tại E. M là trung điểm CB. Chứng minh rằng:

a) BD + CE = DE

b) Tam giác MDE là tam giác vuông cân

#Toán lớp 7

12

CL

Cao Linh Chi

13 tháng 2 2016

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CV

CUTE vô đối

7 tháng 3 2017

CCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCGCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCC

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