\begin{array}{c} \color{#db1616}{\texttt{#Khoadang09}} \end{array}

while True:
    a, b, c = map(float,input("Nhap 3 canh: ").split())
    if a + b > c and a + c > b and b + c > a : break 
    else : print("--Moi nhap lai--")
p = (a + b + c) / 2
print("Dien tich: {:.2f}".format((p * (p - a) * (p - b) * (p - c))**0.5))

a, b, c = map(int, input("Nhap do dai 3 canh: ").split())
if a + b > c and a + c > b and b + c > a: 
    p = (a + b + c) / 2
    print(f'Dien tich tam giac la: {(p * (p - a) * (p - b) * (p - c)):.2f}')
else:
    print("Moi nhap lai")