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This is one of those areas where there is ambiguity.

A 9 cm square is a square whose sides are 9 cm and which therefore has an area of 81 cm2.

But 9 cm2 represents an area of 9 square centimetres. The shape of this area is unspecified.

When written in the above form, the ambiguity is less obvious but in spoken form it is.

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Q: What is 9cm square?

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if you have a box that is 9cm long and 3cm wide then you would say width + length + width + length because the side opposite from 3cm is also 3cm and the side opposite 9cm is also 9cm. so you would add: 9cm+9cm+3cm+3cm = 24cm if you have a box that is 9cm long and 3cm wide then you would say width + length + width + length because the side opposite from 3cm is also 3cm and the side opposite 9cm is also 9cm. so you would add: 9cm+9cm+3cm+3cm = 24cm

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ok if the perimeter is 36cm and it is a square then you know all four sides are equal 36cm / 4sides = 9cm for each side A = L * W ( both the length and width are 9cm because each side is equal ) A = 9cm * 9cm A = 81cm2

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