Geometry

Question Analysis  

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

 

Key Concept Explanation  

Trigonometric Equality: implies (since ).  

45-45-90 Triangle: In this triangle, , satisfying the equality.  

 

Step-by-Step Solution  

1. Rewrite the equation:  

➔ ➔ .  

2. Identify the angle:  

In Quadrant I, corresponds to .  

 

Option Analysis  

0°: Incorrect (, )

30°: Incorrect (

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