Measure by eye length and width of the textbook and write down them in centimeters. Check the answers by means of the tool. On how many you were mistaken

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Approximately: Highway of 15 cm of D 19 cm of Answer was mistaken on 1 cm Correctly: Highway of 14 cm of D 18 cm 20х26. I was not mistaken. We have textbooks for the 3rd class of such size.
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Answer add