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The question asks for the **biconditional statement** corresponding to the given conditional:  
*"If an angle is right, then it has a measure of 90 degrees."*

A **biconditional statement** involves both directions of a conditional:  
- **If A, then B** (original statement)
- **If B, then A** (converse statement)

The structure of a biconditional uses "if and only if" to mean that **both conditions are logically equivalent**.

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Now, let’s analyze the answer options:

1. **"An angle is right if and only if it measures 90 degrees."**  
   - This is the **correct biconditional**. It combines both directions of the conditional:  
     - If an angle is right, it measures 90 degrees.  
     - If an angle measures 90 degrees, it is right.  
   ✔️ This option is correct.

2. **"Measures 90 degrees if and only if an angle is right."**  
   - This option is **grammatically correct** but phrased differently. It reverses the structure but is logically identical to Option 1.  
   ✔️ This could also be valid.

3. **"If it has a measure of 90 degrees and then angle is right then..."**  
   - This option is worded awkwardly and doesn’t correctly express a biconditional.

4. **"If an angle is not right then it doesn't have a measure of 90 degrees."**  
   - This is a **contrapositive** of the original statement, not a biconditional. 

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The best choices are **Option 1 or Option 2**. Both express the same biconditional relationship. Depending on your instructor or exam’s phrasing preference, either could be acceptable.

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Do you need more details or have any questions?  
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**Five related questions:**

1. What is the difference between a conditional and a biconditional statement?
2. How do you form the contrapositive of a conditional statement?
3. What makes two statements logically equivalent?
4. What are some other examples of biconditional statements in geometry?
5. How do you express a converse of a given conditional statement?

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**Tip:**  
When constructing biconditional statements, ensure both the conditional and its converse are true.

What is the biconditional statement for the following? If an angle is right, then it has a measure of 90 degrees.

Learn how to form a biconditional statement for the condition 'If an angle is right, then it has a measure of 90 degrees.' This problem introduces students to geometric logic and biconditional statements, suitable for Grades 8-10.

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