Chương II : Tam giác
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tam giac abc có b-c=90.cac duong phan giac trong va ngoai cua goc a cat bc o dva e .chung minh rang tam giac ade vuong can
Cho tam giac ABC co AB=AC. Goi M la trung diem doan thang BC
a) chung minh tam giac AMB= tam giac AMC
b) chung minh AM la tia phan giac cua goc BAC
c) duong thang di qua B va vuong goc voi BA cat duong thang AM tai I. Chung minh CI vuong goc voi CA
CAC BAN GIUP MINH VOI
CAM ON NHIEU NHIEU NHA!!!!
Cho tam giac ABC = tam giac DEF. Biet goc A + goc B = 130 do, goc E = 55 do. Tinh cac goc cua moi tam giac.
cho tam giac ABC , ve diem M laqtrung diemcua BC. Trentia doi cua tia Ma lay diem D sao cho MAMD.
a) Chung minh:tam giac ABMtam giac DCM b) Chung minh:AB// DC C) Ke BE vuong goc AM (E thuoc AM), CFvuong goc DM (F thuoc DM). Chung min...
Đọc tiếp
cho tam giac ABC , ve diem M laqtrung diemcua BC. Trentia doi cua tia Ma lay diem D sao cho MA=MD.
a) Chung minh:tam giac ABM=tam giac DCM b) Chung minh:AB// DC C) Ke BE vuong goc AM (E thuoc AM), CFvuong goc DM (F thuoc DM). Chung minh: Mla trung diem cua EF [ve hinh va giai bai tap ho to nhe]
cho tam giac ABC vuong tai C góc B=40 do tia phan giac goc A cat BC tai D tren canh AB lay diem E sao cho EA=AC chứng minh tam giac ADE là tam giac vuong
Cho tam giac ABC, co AC<AB, M la trung diem BC, ve phan giac AD. Tu M ve duong thang vuong goc voi AD tai H, duong thang nay cat tia AC tai F, cat AB tai E. Chung minh rang:
a) Δ AFE can
b) Ve duong thang Bx//EF, cat AC tai K. Chung minh rang: KF=BE
c) Chung minh rang: AE= \(\dfrac{AB+AC}{2}\)
cho tam giac ABC can tai A va tam giac DEF can tai D biet goc A bang 80 do goc E bang 50 do thi
cho tam giac abc can tai a, goc a =90 do, tinh goc b, c
Cho tam giác ABCco A=6cm,BC=8cm ,CÁ=10cm
a, Dinh dang tam giac ABC
b, Tren tia doi cua tia BC lay diem D sao cho BD=BC .Chung minh tam giac ACD can
c,Tren AB lay diem M .Chung minh rang MC=MD va MB la tia phan giac cua goc CMD