các bài tập hình học lớp 9

... ∠M1 = 90 0 ( do tam giác AHM vuông tại H) => ∠C1 + ∠C4 = 90 0 => ∠C3 + ∠C2 = 90 0 ( vì góc ACM là góc bẹt) hay ∠OCK = 90 0 .Xét tứ giác KCOH Ta có ∠OHK = 90 0; ∠OCK = 90 0 ... Bài 36 Cho tam giác nhọn ABC , Kẻ các đường cao AD, BE, CF. Gọi H là trực tâm của tam giác. Gọi M, N, P, Q lần lượt là các hình chiếu vuông góc của D lên AB, BE, CF, AC. Chứng minh :1. Các ... minh:a. BC // DE.b. Các tứ giác CODE, APQC nội tiếp được.c. Tứ giác BCQP là hình gì? Bài 71: Cho 2 đường tròn (O) và (O’) cắt nhau tại A và B; các tiếp tuyến tại A của các đường tròn (O) và...

... có:BC2=DB2+CD2=(BO+OD)2+CD2==BO2+2.OB.OD+OD2+CD2.(1)Mà OB=R.∆AOC cân ở O có OAC=30o. Hình 20CIKJFIAK= MỘT TRĂM BÀI TẬP HÌNH HỌC LỚP 9. Phần 1: 50 bài tập cơ bản.1 -Xét hai ∆EKO và EHO.Do OH.OK=R2=OE2⇒OKOEOEOH= ... 9, chúng ta đều nhận thấy học sinh rất ngại chứng minh hình học. Cũng do học sinh còn yếu kiến thức bộ môn.Hơn nữa giáo viên thường rất bí bài tập nhằm rèn luyện các kỹ năng, đặc biệt là luyện ... động trong quá trình làm bài ,các bài tập trong tài liệu này chỉ có tính cất gợi ý phương án chứng minh chứ chưa phải là bài giải hoàn hảo nhất.Bên cạnh đó để có bài tập riêng của từng giáo...

... + M1 = 90 0 ( do tam giác AHM vuông tại H) => C1 + C4 = 90 0 => C3 + C2 = 90 0 ( vì góc ACM là góc bẹt) hay OCK = 90 0 .Xét tứ giác KCOH Ta có OHK = 90 0; OCK = 90 0 => ... BM. Bài 59 Cho tam giác nhọn ABC , Kẻ các đờng cao AD, BE, CF. Gọi H là trực tâm của tam giác. Gọi M, N, P, Q lần lợt là các hình chiếu vuông góc của D lên AB, BE, CF, AC. Chứng minh :1. Các ... hình bình hành (6) . Từ (6) và (3) => BOCD là hình thoi.3. M là trung điểm của CE => OM CE ( quan hệ đờng kính và dây cung) => OMH = 90 0. theo trên ta cũng có OBH =90 0; BHM =90 0...

... ABC. Hình học 9 - Ôn thi vào 10 Toan67 89. wordpress.com 1 Các bài toán hình học lớp 9 Bài 1. Cho tam giác ABC có ba góc nhọn nội tiếp đờng tròn (O). Các đờng cao AD, BE, CF cắt nhau tại ... Hình học 9 - Ôn thi vào 10 Toan67 89. wordpress.com 5 Bài 23. Cho tam giác ABC vuông ở A. Dựng ở miền ngoài tam giác ABC các hình vuông ABHK, ACDE. 1. Chứng ... OI. IM = IA2. 4. Chứng minh OAHB là hình thoi. 5. Chứng minh ba điểm O, H, M thẳng hàng. Hình học 9 - Ôn thi vào 10 Toan67 89. wordpress.com 4 Bài 17. Cho tam giác đều ABC có đờng cao...

... (O2, r2) theo thứ tự là các đườ ng trònnội tiếp các tam giác ABC, ABH, ACH. Chứng minh20 Bài tập hình học lớp 9 TTBDVH: Lửa ViệtGóc nội tiếp1. Cho đường tròn (O; R ), các dây AB, CD, EF có ... đường tròn (I; r) nội tiếp tamgiác. Các tiếp tuyến với (I) song song với các cạnh củatam giác và tạo với các cạnh này 3 tam giác nhỏ. Gọi22 Bài tập hình học lớp 9 TTBDVH: Lửa ViệtTính chất đối ... miềntrong của tam giác vẽ các đoạn IH, IK, IL lần lượtvuông góc với các cạnh BC, AC, AB. Tìm vị trí của Iđể tổng AL2+ BH2+ CK2có giá trị nhỏ nhất.47 Bài tập hình học lớp 9 TTBDVH: Lửa Việt11....

... TUYỂN TẬP 80 BÀI TOÁN HÌNH HỌC LỚP 9 Bài 1. Cho tam giác ABC có ba góc nh n n i ti p đ ng tròn (O). Các đ ng cao AD, BE, CF c t nhauọ ộ ế ườ ườ ắ t ... ộ ế ĐẶNG NGỌC THANH TRƯỜNG THCS TỐNG VĂN TRÂN 9 TUYỂN TẬP 80 BÀI TOÁN HÌNH HỌC LỚP 9 H 1 3 2 1 1 O E D C B A ∠ CDH = 90 0 ( Vì AD là đ ng cao)ườ => ∠ CEH + ∠ CDH ... ∠COD = 90 0. ĐẶNG NGỌC THANH TRƯỜNG THCS TỐNG VĂN TRÂN2 TUYỂN TẬP 80 BÀI TOÁN HÌNH HỌC LỚP 9 3. Đ ng th ng vuông góc v i AB O c t tia BM t i N. Ch ngườ ẳ ớ ở ắ ạ ứ minh t giác OBNP là hình...

... góc với DE cắt HD tại I .Chứng minh : NI//DK Bài 47/Từ 1 điểm A ngoài (O;R), vẽ 2 tiếp tuyến ( B,C là tiếp điểm ).Vẽ đường kinh CD,Dựng hình bình hành BOHK( OA cắt BC tại H)1/Chứng minh ... ,bán kính TE cắt AC tại J .Chứng tỏ : 3 đường thẳng JG,AH,BC đồng quy tại 1 điểm Bài 49/ : Cho tam giác ABC có 3 góc nhọn nội tiếp đường tròn (O) có AB<AC.Vẽ 3 đường cao AD,BE,CF ... nhau tại 1 điểm L thuộc (O)4/Chứng minh : 3 đường thẳng EL,BD,AK cắt nhau tại 1 điểm Bài 39/ : Cho tam giác ABC có 3 góc nhọn nội tiếp đường tròn (O) ,3 đường cao AD,BE,CF cắt nhau tại...

... ∆FBC:Xem câu 3 bài 35.4/ C/m: BI 2 =BF.BC-IF.IC MỘT TRĂM BÀI TẬPHÌNH HỌC LỚP 9. Phần 1: 50 bài tập cơ bản.1 Lời nói đầu:Trong quá trình ôn thi tốt nghiệp cho học sinh lớp 9, chúng ta đều ... lớp 9, chúng ta đều nhận thấy học sinh rất ngại chứng minh hình học. Cũng do học sinh còn yếu kiến thức bộ môn.Hơn nữa giáo viên thường rất bí bài tập nhằm rèn luyện các kỹ năng, đặc biệt là luyện ... động trong quá trình làm bài ,các bài tập trong tài liệu này chỉ có tính cất gợi ý phương án chứng minh chứ chưa phải là bài giải hoàn hảo nhất.Bên cạnh đó để có bài tập riêng của từng giáo...

... được.Chú ý: Trong các tứ giác đã học thì hình chữ nhật, hình vuông, hình thang cân nội tiếp đượcđường tròn. Bài 1. Cho tam giác ABC cân tại A nội tiếp đường tròn (O) và µA0 0(0 90 )= < <a ... là hình chữ nhật, BLMI là hình vuông. ∆BLP =∆KOI ⇒ LP = OI ⇒ MP = OM = MC ⇒ P ≡ C.d) OM = a. Hình vuông OMCN cạnh a, cố định ⇒ AB đi qua điểm C cố định.BÀI TẬP ÔN CHƯƠNG II Bài ... thì được một hình nón.• Điểm A đgl đỉnh của hình nón.• Hình tròn (O) đgl đáy của hình nón.• Mỗi vị trí của AC đgl một đường sinh của hình nón.• Đoạn AO đgl đường cao của hình nón.2....

... Xác định tâm K của đường tròn Học sinh tự chứng minh 2. Chứng minh CHOD nội tiếp Bài 4 Bài 5 WWW.MATHVN.COMWWW.MATHVN.COM Bài tập luyện thi vào lớp 10 29 Gv : Lưu Văn Chung Chứng minh ... VÀO LỚP 10 Biên soạn : Lưu Văn Chung Bài tập luyện thi vào lớp 10 2 Gv : Lưu Văn Chung WWW.MATHVN.COMWWW.MATHVN.COM Bài tập luyện thi vào lớp ... K P Bài 14 Bài 15 Bài tập luyện thi vào lớp 10 36 Gv : Lưu Văn Chung A MN B H K C O’ O I D 1. Chứng minh H  BC Chứng minh 0 90 AHB  và 0 90 AHC...

... www.Vuihoc24h.vn – Kênh học tập Online Page 1 ÔN TẬP HÌNH HỌC LỚP 9 100 BÀI TẬP HÌNH HỌC CÓ LỜI GIẢI PHẦN 1 Bài 1: Cho ABC có các đường cao BD và CE.Đường thẳng DE cắt...

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... số giữa hai bán kính các đ-ờng tròn ngoại tiếp bằng tỉ số đồng dạng. ta có : LP 9- TON- HèNH HC- TUYN CHN GIUPHOCTOT.VN 1 Tuyển tập 80 bài toán hình học lớp 9 Bài 26. Cho đ-ờng tròn ... 2(4 3 34R LỚP 9- TOÁN- HÌNH HỌC- TUYỂN CHỌN GIUPHOCTOT.VN 13 Bài 50: Cho nửa đường tròn (O), đường kính AB=2R. Trên tia đối của tia AB lấy điểm E (EA). Từ E, A, B kẻ các tiếp tuyến ... => B và C nhìn DE d-ới cùng O E D C B A LỚP 9- TOÁN- HÌNH HỌC- TUYỂN CHỌN GIUPHOCTOT.VN 12 Bài 48: Cho ∆ABC vuông (ABC = 90 0; BC > BA) nội tiếp trong đường tròn đưòng kính...