If it's a regular decagon then its perimeter is 10*25 = 250 cm
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Perimeter = 5*5 = 25 cm
100 cm
Then the square will have 4 equal sides of 5cm with a perimeter of 20cm and an area of 25 square cm
The perimeter is 7 cm
The perimeter of a rhombus is the sum of its 4 sides