Answer:
The exact answer is 10 pi km
Step-by-step explanation:
The circumference of a circle is given by
C = pi * d
C = pi * 10
C = 10 pi
circumference formula=2pi r
finding radius using diameter
r=d/2
r=10km/2
r=5km
now putting the value of r in circumference formula
c=2 pi r
c=2×3.14×5km
c=31.4km
