Respuesta :

28.26 cm

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)