Geometry

Question Analysis  

Determine the Quadrant I angle where , leveraging 45-45-90 triangle properties.  

 

Key Concept Explanation  

In a 45-45-90 triangle, for .  

This value is unique to 45° among common special angles in Quadrant I.  

 

Step-by-Step Solution  

1. Recall sine values for special angles:  

, , , .  

2. Match the given value: corresponds to .  

 

Option Analysis  

90°: Incorrect (

Click "Show Answer" to reveal the answer and analysis