A 10 cm wide rectangular wood strip is sawed from a square board. The area under the saw is 800 square meters. Then the side length of the square board is 10 cm

10cm = 0.1M
Side length of square board = 800 △ 0.1 = 8000 (m) = 800000 (CM),
What a big square board!
If the sawing area is 800 square centimeter,
The side length of the square board is 800 △ 10 = 80 (CM),

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