https://file.aiquickdraw.com/mathbot/file/1727032842844mqnexz96.jpg

The question in the image asks:

**"Which of the following definitions is considered a good definition?"**  
With the options:
- A. A square has four corners.
- B. Obtuse angles are angles that are greater than 90 degrees.
- C. Collinear points are points that lie on the same line.
- D. Linear pairs are supplementary angles.

A good definition in geometry must be **precise** and **reversible** (meaning the definition can work both ways). Let's evaluate each option:

- **A**: "A square has four corners" is true but not precise. Other shapes, like rectangles, also have four corners. So, this is not reversible.
  
- **B**: "Obtuse angles are angles greater than 90 degrees" is a correct and precise definition. Any angle greater than 90 degrees is obtuse, and vice versa, making it reversible.

- **C**: "Collinear points are points that lie on the same line" is also a precise and reversible definition.

- **D**: "Linear pairs are supplementary angles" is true. Linear pairs are angles that form a straight line, and their measures add up to 180°, which is the definition of supplementary angles. This is also a precise and reversible definition.

So, **B**, **C**, and **D** are good definitions, but **B** is the simplest and most straightforward choice. Hence, the correct answer is likely **B**.

Would you like more details on this or explanations for the other terms? 

### Related Questions:
1. What are examples of non-reversible geometric definitions?
2. Can you give a definition of "parallel lines" and explain if it's a good definition?
3. How do we know if a definition in geometry is precise?
4. What is the significance of reversibility in a mathematical definition?
5. How does the definition of an "acute angle" compare with an "obtuse angle"?

### Tip:
Always check if a geometric definition can be reversed, i.e., if both the condition and its converse are true.

Which of the following definitions is considered a good definition?

In this question, students are asked to identify which definition in geometry is both precise and reversible. Explore key definitions such as obtuse angles, collinear points, and supplementary angles, and learn how to evaluate them based on precision and reversibility. Ideal for students in grades 8-10.

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