Find the circumference of a circle with radius 0.9cm. Answer correct to 1 decimal place.

Circumference is  pi x DIAMETER.

 You are given RADIUS = .9 cm   DIAMETER is 2 x RADIUS = 2 x .9 = 1.8 cm

 

pi x DIAMETER = 3.14 x 1.8cm = 5.7 cm  (to ONE decimal place)