this is the code for calculating the area of a circle. It is an effective code or I need to improve it?

Question

print("tinh dien tich va chu vi hinh tron")
print("cong thuc tinh hinh tron la s=r*r*3.14")
print("cong thuc tinh chu vi hinh tron la v=2*3.14*r")
r=int(input("nhap r vao"))
print(r)
print("cac ban co 3 luot nhap r")
lan_nhap=3

for lan_nhap in range(0,lan_nhap):
lan_nhap+=1
if r<0:
print("r ko hop le")
r=int(input("nhap lai"))
if r==0:
print("r ko ton tai")
r=int(input("nhap lai"))

if r>0:
print("bay h tinh dien tich va chu vi")
cv=2*r*3.14
print("day la chu vi",cv)
dt=r*r*3.14
print("day la dien tich",dt)

Answer 1

> 99% of the people here don't understand Vietnamese. It's difficult to tell if a code can be improved if we can only guess what it does

Answer 2

Please paste your code in the Code Playground and share the link. It would make it easier for people to help you. Thanks!