Tính đáy bé: 21-8.2=
Tính chiều cao: 56x2:7=
Dt: (21+đáy bé)xchiều cao :2
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Mot thua ruong hinh thang co do dai day lon la 21m va lon hon canh day be la 8,2m. Neu mo rong day lon them 7m thi dien tich tang them la 56 met vuong. Tinh dien tich thua ruong
mot thua roung hinh thang co do dai day lon la 21m va do hon canh day be la 8.2m. Neu mo rong day lon them 7m thi dien tich tang them 56mvuong . Tinh dien tich thua ruong
mot thua ruong hinh thang co do dai day lon la 21 m va dai hon canh day be la 8,2 m neu mo rong day lon len 7 m thi dien tichg tang them 56 m tinh dien tich thua ruong
mot thua ruong hinh thang co dien tich la 361.8 m2. day lon hon day be 13,5 m. hay tinh do dai moi day biet rang neu tang day lon them 5,6m thi dien tich thua ruong tang them 33,6 m2
mot thua ruong hinh thang co trung binh cong hai day la 39m. day lon hon day be 14m. chieu cao bang 1/2 day lon.
a. tinh dien tich thua ruong hinh thang
b. neu mo rong day lon them 4m thi dien tich thua ruong tang them bao nhieu metvuong
mot thua ruong hinh thang co dien tich la 361.8m2 , day lon hon day be la 13.5m.Hay tinh do dai moi day, biet rang neu tang day lon them 5.6m thi dien tich thua ruong tang them 336m2
mot thua ruong hinh thang co dien tich la 228m2 day lon hon day be 14.2 m2 hay tinh day lon biet rang neu tang day be them 4 cm thi dien tich thua ruong tang 18 cm
Cho mot thua ruong hinh thang co day lon 62,5m,day be bang 2/5 day lon.Nguoi ta mo rong thua ruong bang cach keo dai day be them 12,4m va day lon them 8m nen dien tich thua ruong tang them 367,2m2.Tinh dien tich thua ruong hinh thang luc dau?
mot thua ruong hinh thang co dien tich = 228m2 day lon hon day be 14.2m hay tinh day lon biet rang neu tang day be them 4.5cm thi dien tich thua ruong tang them 18m2