On the four corners of a square with a side length of 8 decimeters, subtract a square with a side length of 2 cm to find the perimeter of the remaining figure

On the four corners of a square with a side length of 8 decimeters, subtract a square with a side length of 2 cm to find the perimeter of the remaining figure

After cutting the corners, the perimeter of the four corners is no less, which can be obtained by drawing, so the perimeter of the remaining figure is 32 decimeters

For a square with a side length of 1 decimeter, if the small square with a side length of 1 cm is cut off from each of the four corners, then its perimeter is compared with the original ()
A. Constant B. decrease C. increase

As shown in the figure above, after cutting a small square ABCD, the lengths of AB and AC are cut off, but the lengths of BD and CD are added, and ab = CD = BD = AC is the same as cutting a square at the other three corners, so the perimeter of the later figure is equal to the original perimeter; so select: a

After folding the square paper with side length of 1 N times, what is the area of the figure?

When the square paper with side length 1 is folded once, the area of the figure is 12. When the square paper with side length 1 is folded twice, the area of the figure is 12 × 12 = (12) 2. When the square paper with side length 1 is folded three times, the area of the figure is 12 × 12 × 12 = (12) 3. When the square paper with side length 1 is folded n times, the area of the figure is (12) n