Let x be the length of the 3rd side (which is shortest), in meters.

Then the length of each of two other congruent sides is x + 2 meters.

The perimeter is x + (x+2) + (x+2) = 3x + 4 meters.

The equation is 

3x + 4 = 16,

3x = 16 - 4 = 12,

x =  = 4 meters.

Answer. The shortest side is 4 meters long. Two other congruent sides are 6 meters long each.

Sides:   

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