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 Class 7 Mathematics Length, Perimeter and Area: Perimeter and Circumference

The diagram below shows a plot of land made up of two semi-circles with same centre. The diameters of the semi-circles are 28metres and 56 metres.
If pegs were put at intervals of 2 metres all the way round, how many pegs were used? (Take #pi=22/7#)
figperimeter19520201155.JPG
A. 78
B. 66
C. 80
D. 144

 (4m 49s)
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