Hinh thang ABCD co AB//CD,goc A bang 3 lan goc D,goc B tru goc C bang 30 khi do goc A cong goc B bang?
Cho hinh thang ABCD co AD song song BC, D bang 60 do duong cheo AC vuong goc CD, AC la pg BAD. Tinh A,B,C cua hinh thang,biet BC bang 3 cm.Tinh chu vi cua hinh thanh
BAI 1 : cho hinh thang ABCD khong co goc vuong biet tong do dai 2 canh day AB va CD thi bang do dai canh ben AD cmr cac duong phan gaic trong goc A vs goc D di qua trung diem E cua BC
Bai 2 : cho hinh thang ABCD co AB//CD cmr neu CD = AD + BC thi cac duong phan giac cua cac goc A va B cat nhau tai 1 diem thuoc canh day CD
Lam giup mink vs mink dang gap lam . THANKS
cho hinh thang ABCD ( AD song song BC ) . Co goc ADC = 600 , AC vuong goc CD , AC la tia phan giac goc BAD
Tinh goc DAC , goc DAB
Tinh cac goc cua hinh thang
cho hinh thang ABCD AB//CD co goc D =60 do,AB=AD
a,Tinh cac goc cua hinh thang
b,chung minh BD la tia phan giac cua goc ADC va tinh goc DBC
ve hinh luon nhe
Cho hinh thang ABCD(AB song song DC) co BD la phan giac goc D va BD vuong goc vs BC.Biet AB bang 6, goc D la 60 do.Tinh DC, canh ben,duong cao va duong cheo hinh thang ABCD
cho hinh thanh ABCD AB//CD co gocA -gocD =200,goc B= 2 goc C.
tinh cac goc cua hinh thang
Cho hinh thang vuong ABCD ( goc A bang goc D = 90 do) AB= 3cm, CD = 7cm,AD = 4cm
A) Tinh dien tich hinh thang ABCD
B) Goi M,N lan luot la trung diem cua AD,BC,H la hinh chieu cua N tren CD. Tinh dien tich tu giac MNHD
cho hinh thang can abcd (ab song song cd và ab<cd)canh ben dai 1 cm goc tao boi day lon va canh ben co so do bang 60 do cd=2,7 cm tinh do dai ab