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

A plot of land is in the shape of semicircle of diameter 28 metres as shown below. The plot was fenced by erecting posts 4 metres apart. How many posts were used? (Take #pi=22/7#)
figperimeter19520201216.JPG
A. 12
B. 17
C. 18
D. 19

 (2m 24s)
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