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Q.3 A cube is three dimensional figure as shown in Fig 11.11. It has six faces and all of them are identical squares. The length of an edge of the cube is given by l. Find the formula for the total length of the edges of a cube.
Answer :
Length of an edge of the cube = l
Number of edges = 12
Total length of the edges
= Number of edges × length of an edge
=12l