The circumference of a circle is 3π in. What is the area of the circle? ​ 1.5π ​ in² ​ 2.25π ​ in² ​ 6π ​ in² ​ 9π ​ in²

C = 2πr
so
r = C/2π
r = 3π/2π
r = 3/2
r = 1.5

A = πr^2
A = π(1.5)^2
A = 2.25π 

answer
2.25π ​ in²