The perimeter of a square is 2.4 decimeters, and its area is () square meters

The perimeter of a square is 2.4 decimeters, and its area is () square meters

The perimeter of a square is 2.4 decimeters, and its area is (0.36) square meters

The area of a square is 81 square decimeters. What's its perimeter

9×9=81
Side length = 9 decimeters
Perimeter = 9 × 4 = 36 decimeters
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The bottom area of a cuboid is a square with a perimeter of 8 decimeters. Its surface area is 20 square decimeters. How many cubic decimeters is its volume?

First, calculate the area of the two bottom surfaces
8 △ 4 = 2 (decimeter) 2 × 2 = 4 (square decimeter)
Then find its height
(20-4 × 2) △ 4 △ 2 = 1.5 (decimeter)
If you know the bottom area and the height, you can calculate the volume
4 × 1.5 = 6 (cubic decimeter)