The area of any regular polygon when a side length is know is just:
A(s,n)=ns^2/(4tan(180/n)) in this case:
A(26, 7)=(7*26^2)/(4tan(180/7))
A(26, 7)=2456.5 mm^2 to nearest tenth of a mm^2
1200 squares because, 3 m = 300 cm and a square has 4 sides so you times 3 and 4 and you get 12 so 12 m = 1200 cm
Explanation in this file
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Moses is incorrect.
40miles - 4 miles = 36 miles
36 miles/4 days = 9 miles/day