một hình tam giác có do dai 2 canh là 12,35 và 15m 65 cm là sao tui không hỉu
đổi 15m65cm=15,65m
cạnh thứ 3 dài số m là :
(12,35+15,65):2=14 m
=> chu vi tam giác đó là :
15,65+12,35+14=42 m
đáp số : 42m
42 m day to chac chan 10000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000