Các câu hỏi tương tự
mot tia toi va 1 tia phan xa hop voi phuong ngang nhung goc la 40 do va 20 do .Hay tim cac vi tri dat guong
nguoi ta dung 1 guong phang de chieu mot chum tia sang hep xuong day cua mot cai gieng thang dung, biet cac tia sang mat troi nghieng 1 goc 30 do so voi mat phang nam ngang. Khi do, goc hop boi giua mat phan xa cua guong va phuong nam ngang mot goc
90do
60do
30do
45do
Mot tia toi SI co phuong nam ngang, chieu tu phai sang trai cho tia phan xa IR co phuong thang dung, chieu tu duoi len tren.
a)xac dinh vi tri dat guong va tinh goc phan xa.
b) guong hop voi phuong nam ngang goc bao nhieu do?
vat li 7
cho 3 tia OA,OB,OC tao thang 3 goc AOB, BOC,AOC.CM tua doi cua 1 trong o goc nay la tia phan giác tao boi 2 tia kia thi goc do = nhau
cho 2 duong thang xx' va yy' cat nhau tai O .GOC xoy =80 do.tinh so do cac goc tao boi 2 duong thang xx'va yy'
lam on nhanh len to can trong toi nay lam on
cho tam giac ABC vuong can tai A. Chung minh tia phan giac AD cua BAC chia doi goc tao boi duong cao AH va trung tuyen AM
BAI 1 : HAI DUONG THANG ab VA cd CAT NHAU TAI o TAO THANG GOC aoc = 50 do . GOI om LA TIA PHAN GAC CUA aoc , on LA TIA DOI CUA om .
A) TINH CAC GOC bon , don
B) TINH SO CAP GOC DOI DINH KHAC GOC BET CO TRONG HINH
C) TINH SO CAP GOC DOI DINH KHAC GOC BET DUOC TAO BOI n DUONG THANG DONG QUY ( n THUOC Z ; n LON HON BANG 2 )
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
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