Mot hing thang co day lon la 48cm day nho bang 75% day lon nguoi ta mo rong day lon them 8cm va day nho them 12cm thi duoc mot hinh thang moi co dien tich lon hon dien tich hinh thang ban dau la 100cm2 .Tinh dien tich hing thang ban dau?

Mot hinh thang co day be la 19 cm va bang 1/2 day lon. Neu mo rong day lon them 4,5 cm thi dien tich tang them 27 cm2. Tinh dien tich hinh thang ban dau.

mot manh dat hinh thang co day be 8.5m day lon 15m sau khi mo rong day lon them 3m thi dien tich manh dat tang 7.5m2 tinh dien tich hinh thang ban dau.

mot thua ruong hinh thang co day lon  62,5,day be bang 2/5 day lon .nguoi ta mo rong thu ruong bang cac keo dai day be them 12,4m va day lon them 8 m nen dien tich thua ruong tang them 367.2.tinh dien tich thua ruong hinh thang ban dau 

cho hinh thang co day lon hon daY  be 6,5 m nguoi ta mo rong day lon them 6,5 m thi dien tich tang them 50,7 m2 tinh dien tich hinh thang ban dau

mot hinh thang co day be bang 3/5 day lon va co chieu cao bang 23cm.Nguoi ta mo rong hinh thang bang cach keo dai day be cho bang day lon da duoc1 hinh chu nhat ,sau khi mo rong thi dien tich tang them 207cm vuong .Tinh dien tich hinh thang luc chua mo rong?

mot hinh thang co day lon 60cm day be 38cmneu keo dai day lon them 20 cm va day be 12cm ve cung mot phia thi dien tich se tang them 512cm vuong.Tinh dien tich hinh thang luc dau

mot am ruong hinh thang co day lon 100m day be bang 70%day lon neu mo rong day lon 8m thi dien tch tang them 80m2 tinh dien tich ban dau

mot dam dat hinh thang co dien tich 369 met vuong day be bang 2/3 day lon neu tang day lon them 5,6m thi dien tich tang them 33,6m . Tinh do dai moi canh day cua dam dat hinh thang ban dau