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A kilometre is 100,000 centimetres long. A square kilometre is one kilometre long and one kilometre wide. A square centimetre is one centimetre long and one centimetre wide. If you filled up a kilometre-sized square (a square kilometre) with centimetre-sized squares (square centimetres) you would need 100,000 rows of 100,000 square centimetres, which comes to 10^10, or 10,000,000,000 (10 billion) square centimetres.

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Q: How many centimeters squared are in one kilometre squared?
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