Question

find the area of a square whose perimeter is 320 metres

Answer 1

4a=320
a=80
area of square =a×a
=80×80

=6400 m^2

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Answer 2

perimeter = 320
4a = 320
a = 320/4
a = 80m.

area = a^2
= 80^2
= 6400m^2.