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Mathematics

If the perimeter of one face of a cube is 40 cm, then the sum of lengths of its edge is

  1. 80 cm

  2. 120 cm

  3. 160 cm

  4. 240 cm

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Answer

Each face of cube is a square. Let length of each side = x cm.

Given, perimeter = 40 cm.

∴ 4x = 40 cm

⇒ x = 10 cm.

There are 12 edges in a cube.

Sum of edges = 12 × 10 = 120 cm.

Hence, Option 2 is the correct option.

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