The surface of which of the following does not represent a plane?

Options

A. A book
B. Wall
C. Floor of your room
D. A football

Answer

To determine which surface does not represent a plane, we need to understand the definition of a plane and how it differs from other shapes.

### Step-by-Step Solution:

1. **Understand the Definition of a Plane:**
A plane is a flat, two-dimensional surface that extends infinitely in all directions. It has no thickness and is characterized by having straight edges.

2. **Identify the Given Options:**
We need to consider the surfaces provided in the options. For example, if the options include a flat sheet of paper, a table top, a wall, and a football, we will analyze each one.

3. **Analyze Each Option:**
- **Flat Sheet of Paper:** This is a plane because it is flat and extends in two dimensions.
- **Table Top:** This is also a plane as it is flat and has two dimensions.
- **Wall:** A wall can be considered a plane as it is flat and extends in two dimensions.
- **Football:** A football is spherical in shape, meaning it curves and does not have a flat surface.

4. **Conclusion:**
Since the football is the only option that does not represent a flat surface, we conclude that it does not represent a plane.

### Final Answer:
The surface that does not represent a plane is **A, football**.