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
ve goc vuong xAy Ve goc x'Ay' doi dinh voi goc xAy .Hay viet ten 2 goc vuong ko doi dinh
ve goc vuong xay .ve goc x'ay' doi dinh voi goc xay.hay viet ten 2 goc vuong khong doi dinh
cho goc AOB bang 80 do. tia OM LA TIA PHAN GIAC CUA AOB. VE GOC COD LA GOC DOI DINH CUA AOB (OC DOI NHAU VOI OA) TINH COM
Cho goc bet AOB. Tren cung mot nua mat phang bo AB, ve hai tia OC va OD sao cho AOD=BOC=30 do.
a/Hai goc AOD va BOC co phai la hai goc doi dinh khong/ Vi sao?
b/ Ve tia OM sao cho tia OA la tia phan giac cua goc DOM.Chung minh rang hai goc AOM va BOC la hai goc doi dinh
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
Tam giac ABC co ^B=^C tia phan giac cua goc ABC cat BC tai d ve tia Ax la tia doi cua tia AB
a)trong goc cax ve tiaAy||BC. chung minh rang tia ay la tia phan giac cua goc CAx
b)chung minh AD vuong goc voi BC
Cho goc vuong AOB va tia OC nam trong goc do. Ve tia Ox sao cho OA la tia phan giac cua goc xOC , ve tia Oy sao cho OB la tia phan giac cua goc yOC. Chung to rang O, Oy la hai tia doi nhau
Cho goc vuong AOB va tia OC nam trong goc do .Ve tia Ox sao cho OA la tia phan giac cua goc xOC,ve tia Oy sao cho OB la tia phan giac cua goc yOC.Chung to rang Ox,Oy la hai tia doi nhau