Trace the shape below and fold it to determine if its sides will perfectly fit on top of each other. Verify your answer by cutting and folding to see if they are correct.

Here are the answers to the questions about the shape:

2.1.1) When the shape (a rectangle) is folded through the dotted line (a diagonal), the two halves do not exactly fit on top of each other in a symmetrical way. A diagonal is not a line of symmetry for a rectangle unless it is also a square.

$$\boxed{\text{No}}$$

2.1.2) A rectangle has two lines of symmetry. These lines pass through the midpoints of opposite sides.

$$\boxed{2}$$

2.1.3) The 2-D shape shown is a rectangle.

$$\boxed{\text{Rectangle}}$$

2.1.4) The shape has straight sides.

$$\boxed{\text{Straight sides}}$$

2.1.5) A rectangle has four sides.

$$\boxed{4}$$

2.2) This question refers to the same shape as 2.1.1. When the rectangle is folded through the dotted line (its diagonal), the two halves do not exactly fit on top of each other.

$$\boxed{\text{No}}$$