Question 275872
C=2(pi)r
2(pi)r=4(pi)/3 
r=4(pi)/3 * 1/2(pi)
=4(pi)/6(pi)
=2/3
.
A/2=(pi)r^2/2
=(pi)(2/3)^2/2
=(pi)(4/9) * 1/2
=(2(pi))/9
.
Ed