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trong mot manhdat co dien tich 240 m2.Nguoi ta dao mot cai gieng hinh tron co duong kinh 1,2.Bao quanh mieng gieng la mot thanh gieng co dien tich la 1,12m2.Tinh dien tich phan dat con lai .Biet manh dat tren la hinh thang vuong .Keo dai day be them 7,5m thi manh dat tro thanh hinh chu nhat ,dien tich manh dat sau khi tang bang 125% so voi dien tich ban dau .Tinh day lon ,day be cua manh dat ban dau ? AI GIUP MINH VOI
Mot manh dat hinh thang co day lon bang 75m,day be bang 75% day lon va bang chieu cao.
a,tinh dien tich hinh thang do
b,neu nguoi ta muon tang dien tich manh dat hinh thang them 75m22 nua thi phai keo dai day be them bao nhieu m?
mot manh dat hinh tam giac co do dai day la 40 m chieu cao co do dai bang 2/5 day
tinh dien tich cua manh dat do
nguoi ta mo rong day manh dat dai them mot doan nua thi dien tich manh dat tang them 40 m2 tinh do dai day duoc mo rong
tinh ti so phan tram dien tich dat tang them va dien tich dat truoc khi chua mo rong
Mot mieng dat hinh thang co dien tich 864m vuong day lon hon day be 12m. Nguoi ta mo rong mieng dat bang cach tang day lon them 5m thi duoc mot mieng dat moi co dien tich bang 924m vuong. Tim do dai be va day lon cua manh dat hinh thang luc chua mo rong
mot dam ruong hinh thang co dien tich 1155m2 va co day be kem day lon 33m nguoi ta keo dai day be them 20m va keo dai day lon them 5m ve cung mot phia de duoc hinh thang moi dien tich hinh thang moi nay bang dien tich cua mot hinh chu nhat co chieu rong bang 30m va chieu dai 51m hay tinh day be day lon cua hinh thang ban dau
mot mieng dat hinh tam giac co day la 15 m va chieu cao la 7,8m nay nguoi ta MO RONG MIENG DAT VE BEN PHAI BANG CACH KEO DAI CANH DAY THEM 3,5 HAY TINH DIEN TICH MANH DAT SAU KHI MO RONG
mot mieng dat hinh tam giacco day la 15 va chieu caola 7,8 m nay nguoi ta mo rong manh dat ve ben phai bang cach keo dai canh day them 3,5 m hay tinh dien tich manh dat sau khi mo romg
mot manh dat hinh thang co trung binh cong hai day la 46 m. neu day lon keo dai them 7 m nua thi dien tich manh dat thi manh dat tang them 140 m2.tinh dien tich manh dat hinh thang.
mot dam ruong hinh thang co dien tich 1155m2 va co day be kem day lon 33m nguoi ta keo dai day be them 20m va keo dai day lon them 5m ve cung mot phia de duoc hinh thang moi dien tich hinh thang moi nay bang dien tich cua mot hinh chu nhat co chieu rong bang 30m va chieu dai 51m hay tinh day be day lon cua hinh thang ban dau