rosalind:
picture to go with question: [link]http://i48.tinypic.com/vi16zc.jpg[/link]
The running track needs the lane markings repainted. The lane markings are the straight and curved lines around the track.
The lanes are 1 metre wide.
One litre of paint is needed to cover 12m of lane markings.
One litre of paint costs 3.15
C = 3.14*d
C = Circumference of a circle
d = diameter of a circle
how much will the paint cost? show your working