Hinh thang vuong ABCD coAB = AD = 1/2DC . mo rong hinh thang ve phia canh ben de co hinh chu nhat AECD , biet phan mo rong co dien tich 32 m2 . tinh dien tich hinh thang ABCD

Cho hinh thang co duong cao 10 cm . Hieu hai day la 22 cm . Keo dai day nho bang day lon de thanh hinh chu nhat co chieu dai bang day lon, chieu rong bang chieu cao hinh thang . Dien tich duoc mo rong them bang 1/7 dien tich hinh thang cu.Phan mo rong ve phia ben phai co dien tich 90cm vuong .Hay tinh day lon cua hinh thang ban dau

mot thua ruong hinh thang co chieu cao la 10m hieu cua 2 canh day la 22m.Nguoi ta mo rong thua ruong do thanh hinh chu nhat co chieu daibang canh day lon va chieu rong bang chieu cao .Dien tich duoc mo rong bang 1phan7 dien tich cu .phan dat mo mo rong them ve phia tay phai la 90m vuong .Tinh day lon cua thua ruong cu

1 hinh thang co chieu cao 10m , hieu hai day la 22 m . Keo dai nho cho bang day lon thanh 1 hinh chu  nhat co chieu dai bang day lon, chieu rong bang chieu cao . Dien tich mo rong 1/7 dien tich cu. Phan mo rong ve phia tay phai co  dien tich 90 m2. Tinh day lớn của hình thang ban đầu .

                                    _{Mot hinh thang co chieu cao bang 10m hieu 2 day la 22m keo dai day nho bang day lon de hinh da cho thanh hinh chu nhat co chieu dai bang day lon chieu rong bang duong cao hinh thang dien tich duoc mo rong them 1/ 7 dien tich hinh thang cu phan mo rong them co dien tich la 90m2 tinh do dai day lon cua hinh thang ban dau} 

CHo hinh thang vuong ABCD co AB=AD=1/3 DC.MO rong hinh thang thanh hinh chu nhat AECD voi dien tich hinh tam giac BEC la 25cm vuong.

a,Dien tich hinh thang ABCD la:

b,Ti so phan tram the tich hinh tam giac BEC va hinh thang ABCD la

1 hinh thang co chieu cao la 10m hieu 2 day la 22m keo dai day nho = day lon de hinh da cho thanh hinh chu nhat co chieu dai = day lon chieu rong = duong cao hinh thang dien tich duoc mo rong them = 1/7 dien tich hinh thang cu 1 phan mo rong them co dien tich la 90m2 

mot hinh thang vuong co day be bang 3/5 day lon va chieu cao la 23m .Nguoi ta mo rong thua ruong ve phia canh ben khong vuong goc voi hai day de thua ruong thanh hinh chu nhat .Sau khi mo rong dien tich tang len 207m2 .

a,Tinh dien tich hinh thang ban dau 

b,Tinh xem sau khi mo rong dien tich tang len bao nhieu phan tram

                ghi cach giai giup minh nhe .Cam on.

Mot thua ruong hinh thang vuong co day be bang chieu cao va bang mot nua day lon .Thua ruong do duoc mo rong thanh hinh chu nhat. Tinh dien tich hinh thang biet dien dien tich phan mo rong la 5dam2.