Line DE is 15
Line PQ is 5
Line DF is 21
Line PR is x
15/3 = 5
21/3 = 7
Line PR is 7
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The characteristic length of a cube refers to the length of a side of a cube. Since the length of all the sides of a cube are the same, the characteristic length refers to all sides.
4 units
it is 5. :)
15 units