A normal dimensional 2x2 is 1.5 inches by 1.5 inches.
no
Yes.
No. Matrix addition (or subtraction) is defined only for matrices of the same dimensions.
21 x 2 has greatest perimeter
If it's a cube, the dimensions are 2 x 2 x 2.
2" x 4"
4 x 4 1 x 16
18" X 24" X 2 - typically
2 cm x 2 cm x 2 cm
1 1/2" x 7 1/4"
2 x 2
Consider a straight line, 2 inches long. It has one dimension. Consider a square 2 x 2. It has two dimensions and its area is 22 or 2 squared. Consider a cube 2 x 2 x 2. It has three dimensions and its area is 23 or 2 cubed.