HCN co chu vi 56 cm neu tang chieu dai them 2 cm va giu nguyen chieu rong thi CVHCN moi lA
mot hcn co cr bang 3/5 cd biet neu tang cr 6 m thi hcn do tro thanh hinh vuong tinh chu vi hcn do?
Mot manh dat HCN co chieu dai hon chieu rong la 14 m neu keo dai moi canh them 2m ta co mot manh dat moi co chu vi la 60 m Tinh dien tich cua manh dat ban dau ?
cho 1 hinh chu nhat co dien tich bang 24cm vuong tang chieu rong them 2 phan3 so do do dai cua no va giu nguyen chieu dai thi duoc mot hcn moi tinh dien tich hcn au khi mo rong
Nua chu vi cua hinh chu nhat la 104 cm neu bot chieu dai di 7 cm tang chieu rong them 7cm thi hinh chu nhat tro thanh hinh vuong tinh dien tich hinh chu nhat do
Mot hinh chu nhat co chu vi la 150m , neu giam chieu dai di 15 m va tang chieu rong them 5m thi duoc mot hinh chu nhat moi co chieu rong bang 2/3 chieu dai. Tim chieu dai , chieu rong cua HCN
mot hinh chu nhat co chu vi la 180cm . Neu tang chieu rong them 10va giam chieu dai 10cm thi dien tich ko thay doi . Tinh s hcn do
tinh dt 1 hcn co cd la 36cmbiet neu tang cd them 4cm,giu nguyen cr thi dt hcn tang them 92cm vuong
1 manh dat HCN co CD = 15 m CR 10m duoc ve tren ban do ti le 1: 500 hoi tren ban do do do dai moi canh HCN ay = may cm