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Perimeter of a square =  4 * side  = 4 * 2.5 = 10 cm
       or  2 ( length + breadth) = 2 ( 2.5 + 2.5 ) = 10 cm

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What is perimeter?perimeter s the total length of a given closed figure .according to your question thel=b=2.5cm and there are two ways of finding the perimeter. either you can add all the length and breadth which comes 10cm or the formula for finding the perimeter of a square is 4x(side) as the side is the same because the length of the sides of a square is equal.