tinh the tich hinh lap phuong , biet rang chu vi mot mat cua hinh lap phuong bang chu vi cua mot hinh chu nhat co chieu dai 1,8dm va chieu rong 1,4dm

Xep 8 hinh lap phuong nho co canh 4cm thanh mot hinh lap phuong lon roi son tat ca cac mat cua hinh lap phuong lon .Hoi moi hinh lap phuong nho co may mat duoc son va dien tich duoc son cua moi hinh lap phuong nho la bao nhieu

mot hinh lap phuong co the tich la 125m3 , Mot hinh hop chu nhat co dien tichh day bang dien tich mot mat cua hinh lap phuong va co chieu cao la 3m.Tinh the tich hinh hop chu nhat do

xep 8 hinh lap phuong nho co canh 4cm thanh mot hinh lap phuong lon , roi son tat ca cac mat cua hinh lap phuong lon . hoi ;

a) moi hinh lap phuong nho co may mat duoc son ?

b) dien tich duoc son cua moi hinh lap phuong nho la bao nhieu ?

1 chiec hop giay co dang 1 hinh lap phuong ko co nap biet tong dien tich cua 2 mat bat ki của hinh lap phuong bang 18 dm 2 tinh dien tich giay de lam chiec hop do

mot hop dang hinh lap phuong khong nap nguoi ta da son mat xung quanh mau xanh ,mat day mau trang .tinh ca mat xanh va mat trang co tong dien tich la 605 cm2 tinh canh cua hinh do

nguoi ta xep tam bia hinh lap phuong nho co canh 4cm thanh mot hinh lap phoung lon hon roi son tat ca cac mat cua hinh lap phoung lon hoi moi hinh lap phoung nho co may mat duoc son va dien tich duoc  son cua moi hinh lap phuong nho la bao nhieu

nguoi ta xep 4 hinh lap phuong nho co canh 4cm thanh 1 hinh lap phuong lon roi son tat ca cac mat cua hinh lap phuong hoi moi hinh lap phuong nho co may mat duoc son va dien tich son cua moi hinh lap phuong nho la bao nhieu

mot hinh lap phuong co tong dien tich xung va dien tich toan phan la 250 cm2 .tinh cien tich cua hinh lap phuong , tinh the tich cua hinh lap phuong