28.26 cm
Step-by-step explanation:
Circumference of a circle = 2πr
r = radius
diameter = 9cm
diameter = 2 × radius
radius = diameter/2
radius = 9/2
let π= 3/14
Circumference of a circle = 2 × 3.14 × 9/2
Circumference of a circle = 28.26 cm (nearest hundredth)