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This question is simple if you break it up properly. You need to think of the square as two right triangles. The 20cm chopstick is the hypotenuse. The pythagorean theorem states a^2 + b^2 = c^2
since a and b are the same you can say 2x^2 = c^2
2x^2 = 20^2
2x^2 = 400
2x = 20
x = 10
THE ANSWER IS 10 CM!!
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