Các câu hỏi tương tự
a) duong thang c co vuong goc voi duong thang b ko vi sao
b)cho doan thang d cat 2 duong thang a va b tai A va B cho niet goc A1= 115do . Tinh so do cac goc B2,B3,A3
c)goi AX va By lan luot la tia phan giac cua cac goc A1 va B CHUNG MINH Ax song song By
Chao cac gia su va cac ban.Minh co 1bai toan chua lam duoc.Nhu lan truoc,minh da dat cau hoi ve hinh hoc.Lan nay minh xin dat mot cau nua,mong moi nguoi giup minh bai toan nay :Cho tam giac ABC vuong tai A,co goc B 60 do.a, Tinh so do goc C va so sanh do dai 3canh cua tam giac ABCb,Ve BD la tia phan giac cua goc ABC(D thuoc AC).Qua D ve DK vuong goc voi BC(K thuoc BC) .Chung minh:tam giac BADtam giac BKDc,C/minh :tam giac BDC can va K la trung diem BCd,Tia KD cat BA tai I.Tinh do dai canh ID bie...
Đọc tiếp
Chao cac gia su va cac ban.Minh co 1bai toan chua lam duoc.Nhu lan truoc,minh da dat cau hoi ve hinh hoc.Lan nay minh xin dat mot cau nua,mong moi nguoi giup minh bai toan nay :
Cho tam giac ABC vuong tai A,co goc B =60 do.
a, Tinh so do goc C va so sanh do dai 3canh cua tam giac ABC
b,Ve BD la tia phan giac cua goc ABC(D thuoc AC).Qua D ve DK vuong goc voi BC(K thuoc BC) .Chung minh:tam giac BAD=tam giac BKD
c,C/minh :tam giac BDC can va K la trung diem BC
d,Tia KD cat BA tai I.Tinh do dai canh ID biet AB=3cm(lam tron ket qua den chu so thap phan thu nhat).
Neu ai, gia su co the tra loi duoc cau hoi nay thi xin nhan tin lai cho minh a.Minh xin cam on nhieuuuuuuuu(ve hinh nua nhe! )
Tren duong thag a lay ba diem A,O,A'(O nam giua A va A').Ve tia OB sao cho AOB=45°,tren nua mat phang co bo la duong thang a khong chua tia OB ve tia OC sao cho AOC=90°
a.Goi OB' la tia phan giac cua goc A'OC.Chung minh rang:hai goc AOB va A'OB' la hai goc doi dinh
b,Tren nua mat phang co bo la duong thang a chua tia OB ve tia OD sao cho BOD=90°.Tinh so do goc A'OB'
Cho tam giac ABC co A bang 90 do va AB<AC, tren AC lay D sao cho AD =AB. Tren tia doi cua AB lay E sao cho AE bang AC
A. Chung minh DE vuong goc voi BC
B. Biet 4 goc A = 5 goc C. Tinh goc AED
Ai nhanh nhat minh like cho
Cho tam giac ABC co I la giao diem cac tia phan giac cua goc B va C, M la trung diem cua BC. Biet goc BIM = 90 do va BI = 2 IM
a, Tinh goc BAC
b, Ve IH vuong goc AC. Chung minh rang BA = 3IM
Cho tam giac ABC co I la giao diem cac tia phan giac cua goc B va C, M la trung diem cua BC. Biet goc BIM = 90 do va BI = 2IM
a, Tinh goc BAC
b, Ve IH vuong goc AC. Chung minh rang: BA = 3IH
GIUP MIK NHA
tren cung mot nua mat phang co bo chua tia OA ve hai tia OB va OC sao cho goc AOC = 40° AOB =110° a,tinh so do goc BOC b,ve tia OD la tia doi cua tia OA Tinh so do goc ke bu voi goc AOB c,tia OB co la tia phan giac cua goc COD ko ?vi sao
cho tam giac abc, goc A tu, tren canh BC lay diem M, N sao cho BN=BA, CM=CA
a, so sanh goc AMC va ANB
b, so sanh canh AM va AN
c, biet goc ABC =40 do, goc ACB =30 do , tinh so do 3 goc cua tam giac AMN
Hai duong thang xy va zt cat nhau tai O , biet goc XOT 4 lan goc XOZ . Tinh cac goc con lai : Bai 1ve goc xay 50 do . Ve goc xAy doi dinh xAya) Tinh cac goc con laib)Ve At la tia phan giac cua goc xAy , At la tia doi cua At . Chung to At la tia phan giac cua xAyc) Viet ten cac goc doi dinh : Bai 2Cho goc bet AOB . Tren cung mot nua mat phang bo AB , ta ve 2 tia OC va OD sao cho AOC BOD160 doa) so sanh goc BOC va AODb) goc OE la tia doi cua tia OD . Tia OB co la co phai la tia phan giac cua COE...
Đọc tiếp
Hai duong thang xy va zt cat nhau tai O , biet goc XOT= 4 lan goc XOZ . Tinh cac goc con lai : Bai 1
ve goc xay = 50 do . Ve goc x'Ay' doi dinh xAy
a) Tinh cac goc con lai
b)Ve At la tia phan giac cua goc xAy , At' la tia doi cua At . Chung to At' la tia phan giac cua x'Ay
c) Viet ten cac goc doi dinh : Bai 2
Cho goc bet AOB . Tren cung mot nua mat phang bo AB , ta ve 2 tia OC va OD sao cho AOC =BOD=160 do
a) so sanh goc BOC va AOD
b) goc OE la tia doi cua tia OD . Tia OB co la co phai la tia phan giac cua COE k ? Vi sao ?
Giup minh nha thanks giup de co qua