The minimum perimeter of a polyomino is the perimeter of the most square shape that can be formed. If the area can't form a perfect square, the minimum is formed by wrapping the additional units in a spiral around the smallest square or rectangle.
Since 25 happens to be a perfect square (the square root is 5), the perimeter would be 2(5+5)=20. If the area were between 26 and 30 that would add two additional sides which would be 20+2. After 30 the units would wrap to a new side of the 5x6 arrangement (still a perimeter of 22) yielding a new perimeter of 22+2 or 24, which would persist until it exceeds 6x6, and so on.
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Since the sides of a square with area of 25 are 5 each (5*5=25) the perimeter is going to be 4 * 5 = 20
Area = 25
Then the square will have 4 equal sides of 5cm with a perimeter of 20cm and an area of 25 square cm
20 cm
it has 100 and each side of the perimeter is 25