When introducing mensuration, a teacher writes all the formulae on the board before proceeding further. This reflects that she is following the

Options

A. Experimental approach
B. Practical approach
C. Inductive approach
D. Deductive approach

Answer

To solve the question, we need to analyze the situation described and identify the teaching approach used by the teacher when introducing mensuration.

### Step-by-Step Solution:

1. **Understanding the Scenario**: The teacher writes all the formulas related to mensuration on the board before proceeding with the lesson. This indicates that she is laying a foundation for the topic.

**Hint**: Think about why a teacher would write formulas first. What purpose does it serve in learning?

2. **Identifying Teaching Approaches**: We have several options to consider:
- **Experimental Approach**: Involves hands-on activities and experiments.
- **Practical Approach**: Focuses on real-life applications and practical examples.
- **Inductive Approach**: Starts with specific examples and leads to a general conclusion.
- **Deductive Approach**: Begins with general principles or formulas and applies them to specific cases.

**Hint**: Consider how the teacher is presenting the information. Is she starting with general rules or specific examples?

3. **Analyzing the Options**: Since the teacher is presenting the formulas first, she is providing the general rules before applying them to specific problems or examples. This aligns with the deductive approach.

**Hint**: Recall the definition of deductive reasoning. It involves starting with a general statement and deducing specific instances from it.

4. **Conclusion**: Based on the analysis, we can conclude that the teacher is using the **deductive approach** to introduce mensuration by first presenting the formulas.

**Hint**: Reflect on the structure of the lesson. Does it start with rules or does it start with examples?

### Final Answer:
The teacher is following the **deductive approach** (Option D).