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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
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  • October 6, 2015 at 6:25am
  • Shu Yun:based on diagram redrawn below, there're three lane marking to repaint: Length of black lane marking: 100m*2 + 3.14*40m = 325.6m Length of red lane marking: 100m*2 + 3.14*(21m*2) = 331.88m Length of blue lane marking: 100m*2 + 3.14*(22m*2) = 338.16m Total length: 325.6m+331.88m+338.16m=995.64m Cost:(995.64m/12m)*3.15 = $261.36 (2d.p.)
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    • October 6, 2015 at 2:20pm
  • rosalind:sorry I forgot to put in it says there is four lane markings that need to be repainted as shown on the picture
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    • October 6, 2015 at 7:41pm
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