a circular ground whose diameter is 70 metres , has a 2.8 metre - broad garden around it . what is the area of the garden in square metres ?
import math
n0 = 70.0
n1 = 2.8
t0 = n0 / 2.0
t1 = n1 + t0
t2 = math.pi * t0**2
t3 = math.pi * t1**2
answer = t3 - t2
print(answer)