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

The diagram below shows Amalemba’s piece of land. He put a fence around it. How many posts did she use if the spacing between the posts was 4 metres?
figperimeter19520201047.JPG
A. 54
B. 79
C. 80
D. 81

 (3m 16s)
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