The perimeter of a square is 20 decimeters, and its side length is 20 decimeters______ Decimeter, area is______ Square decimeter

The perimeter of a square is 20 decimeters, and its side length is 20 decimeters______ Decimeter, area is______ Square decimeter

20 △ 4 = 5 (decimeter), 5 × 5 = 25 (square decimeter); answer: side length is 5 decimeter, area is 25 square decimeter; so the answer is: 5, 25