Bai 1: Ve 4 tia chung goc Ax, Ay, Az, At sao cho Ax va Ay doi nhau, 2tia Az va At nam tren nua mat phang co bo chung xy.
a, Tia At nam giua 2 tia nao?
b, Kee ten cac goc ke bu co tren hinh.
Bai 1: Cho \(\widehat{xoy}\)=120. Ve tia phan giac Ot. Tinh \(\widehat{toy}\).
Bai 2: Ve 4 tia chung goc Ax, Ay, Az, At sao cho Ax va Ay doi nhau, 2 tia Az va At nam tren nua mat phang doi nhau co bo chung xy.
a, Tia At nam giua 2 tia nao?
b, Ke ten cac goc ke bu co tren hinh,
Mik giúp nhé:
Bài 1. (hình vẽ không đúng số liệu vì đây là hình minh họa thui, bn thông cảm nhé!!!).
Vì Ot là tia phân giác của góc xOy, nên:
yOt = \(\dfrac{xOy}{2}\) = \(\dfrac{120^o}{2}\) = 60o.
Vậy yOt = 60o.
TIK MIK NHA!!!
cho tam giac ABC co goc a nhon M la trung diem cua BC tren tia doi cua tia MA lay diem D sao cho MA=MD chung minh BAM=CDM chung minh AC=AD tren nua mat phang Bo AB ko chua C ve tia Ax vuong goc AB tren nua mat phang bo AC ko chua B ve tia Ay vuong goc AC tren tia Ax lay Diem P sao cho AP=AB tren tia Ay lay diem Q sao cho AQ=AC chung minh tam giac ABQ= tam giac APC goi giao diem cua DA va PQ la K chung minh AK vuong goc PQ
1 . ve 4 tia chung goc , roi chi ra cac tia nam giua cac tia khac .
2. ve duong thang xy lay 2 diem E va F thuoc 2 nua mat phang doi nhau xy . goi ten cac nua mat phang tren hinh .
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
tren cung 1 nua mat phang co bo chua tia 0x ve tia 0m va 0n sao cho goc x0m =45 do , goc x0n =110 do
a/ trong 3 tia 0m , 0n , 0x ,tia nao nam giua 2 tia con lai ?
b/ tinh so do goc m0n
c/ tren nua mat phang chua tia 0x bo la duong thang chua tia 0m ve goc y0m =115do .chung to ran goc x0y va goc x0n la 2 goc ke bu
GIAI NHANH GIUP MINH VOI NHE , GAP LAM DAY , MINH SE TICH CHO
THANKS!
cho goc xoy = 140 do , tren tia ox , lay diem a ve tia Az sao cho tia Az va tia oy nam tren cung 1 nua mat phang bo chua tia ox va goc oaz = 40 do . a) CMR Az song song oy b) ve tia Az' la tia doi cua tia Az . CMR 2 duong thang phan biet cua 2 goc xoy va goc oaz song song voi nhau
TREN CUNG MOT NUA MAT PHANG CO BO CHUA TIA Ox VE HAI GOC xOy,yOz KE BU NHAU SAO CHO GOC xOy=80 DO
A] TINH GOC yOz
B] GOI Om , On LA CAC TIA PHAN GIAC CUA GOC xOy VA GOC yOz . CHUNG TO GOC mOm LA GOC VUONG
C] TREN NUA MAT PHANG KO CHUA TIA Oy CO BO CHUA TIA Ox , VE TIA Oc SAO CHO GOC xOt=80 DO . TINH mOt
cho goc xoy = 140 do , tren tia ox , lay diem a ve tia Az sao cho tia Az va tia oy nam tren cung 1 nua mat phang bo chua tia ox va goc oaz = 40 do .
a) CMR Az song song oy
b) ve tia Az' la tia doi cua tia Az . CMR 2 duong thang phan biet cua 2 goc xoy va goc oaz song song voi nhau
1)cho tam giac ABC co goc A <90 độ ve tia Ax vuong goc voi AB(Ax va AC cung nam trong nua mat phang bo la duong thang AB) tren tia Ax lay diem d sao cho AD=AB.Ve tia Ay vuong goc voi AC(Ay va AB cung nam trong 1 nua mat phang bờ la doan thang AC )tren tia Ay lay diemE sao cho Ae=Ac.Goi M la trung diem cua canh BC .Chung minh rang
a)AM=1/2DE
b)AM vuong goc voi DE
2)cho tam giac ABCgoi M,N lan luot la trung diem cua AB va AC .Chung minh rang MN//BCva MN=1/2 BC
3)cho tam giac ABC vuong tai A , AH vuong goc voi BC. Biet HC-HB=AB.Chung minh rang BC = 2AB
4)tim so nguyen x,y sao cho:x-2xy+y=0
5)cho tam giac ABC co goc A = 60 độ . Chung minh BC.BC=AB.AB+AC.AC-AB.AC