Cho hinh thang can ABCD co day nho CD=4cm; A+B=1/2(C+D), AC vuong goc BC. Chu vi hinh thang can abcd

cho hinh thang can day nho CD=4cm, goc A + goc B=1/2(goc C + goc D) ,AC vuong goc voi BC.Tinh chu vi hinh thang can ABCD

Cho hinh thang ABCD co day nho BC = 4cm . Tu B ve duong thang song song CD cat AD o E . Biet chu vi tam giac ABE = 12 cm . Tinh chu vi hinh thang ABCD

Cho hinh thang ABCD co day nho AB la 27cm day lon CD la 48cm. Neu keo dai day nho them 5cm thi dien tich hinh thang them 40cm2. Tinh dien tich hinh thang ban dau ABCD.

cho hinh thang ABCD co day nho AB = 18cm, day lon CD = 24cm. tren duong cheo AC lay trung diem E. Noi B voi E; D voi E. Biet dien tich hinh tam giac BCE la 45cm2. Tinh dien tich hinh thang ABCD. minh dang can gap. minh cam on truoc nha.

cho hinh thang abcd co day nho ab day lon cd. goi m la diem chinh giua doan cd. dien tich hinh thang abcd gap dien tich tam giac amd may lan

cho hinh thang vuong abcd co day nho ab =40m day lon cd=60m duong cao ad =40m lay e tren ad g tren bc sao cho eg chia hinh thang abcd lam hai hinh thang co duong cao ae la 10m tinh dien tich hinh thanng abge va egcd

cho hinh thang abcd co day nho ab =dm,day lon cd bang 4/3 day nho.E mot diem nam tren a  sao cho BE /AB=1/3.Noi Evoi C.biet S hinh tam giac BEC la 125 cm2.tinh S hinh thang ABCD

cho hinh thang can ABCD, co day nho AB = 6cm, day lon CD=12cm va canh ben AD =5cm. goi M,N,E,G tuong ung la trung diem cua cac canh AD, BC,AB,CD

a. cmr: MENG la hinh thoi

b. dien tich hinh thoi MENG = bn cm2