1. The problem appears to involve a set of lengths: 2 cm, 7 cm, 4 cm, 5 cm, and 2 cm. 2. Since no specific question is given, let's assume we want to find the perimeter of a polygon with these side lengths. 3. The perimeter $P$ of a polygon is the sum of the lengths of all its sides. 4. Using the formula: $$P = \text{sum of all side lengths}$$ 5. Substitute the given lengths: $$P = 2 + 7 + 4 + 5 + 2$$ 6. Calculate the sum: $$P = 20$$ 7. Therefore, the perimeter of the polygon is $20$ cm.