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Winter vacation homework, Grade Three in Mathematics.
As the picture shows, blue is the ground, white is the river, and orange is the board. This picture shows a corner of a square river, which is 4 meters wide, so the length from the square island corner to the shore corner is 5.66 meters. 1.9? +? 3.8? =? 5.7 meters, 5.66 meters wider than the river.