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import math
r = int(input("Nhập bán kính r"))
if(0<r<=100):
c = 2 * math.pi * r
dientich = math.pi * (r ** 2)
print(f"Chu vi hình tròn là:{c}")
print(f"Diện tích hình tròn là: {dientich}")
else:
print(" Gia tri khong hop le")