Geometry

Question Analysis  

Identify the Quadrant I angle where , focusing on 45-45-90 triangle properties where legs are equal.  

 

Key Concept Explanation  

In a 45-45-90 triangle, the two legs are equal, so .  

On the unit circle, this corresponds to equal x and y coordinates ().  

 

Step-by-Step Solution  

1. ⇒ (dividing both sides by ).  

2. The angle in QI with is .  

 

Option Analysis  

: Incorrect (, )

: Incorrect (,

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