The sum of all the edges of the cube is 69 cm, find the length of the edge of the cube.

The cube has 12 edges (a square on top of 4 edges, a square on the bottom of 4 edges and an edge for each connection of 4 vertices of the square – 4 edges) So we got 12 edges, so the length of one edge we find by dividing the sum of all edges by their number:
69/12 = 5 9/12 = 5 3/4 = 5.75 cm

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