Geometry

Question Analysis  

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

 

Key Concept Explanation  

Tangent Ratio: . For , the opposite and adjacent sides (legs) must be equal, forming a 45-45-90 triangle.  

On the unit circle, this corresponds to , where .  

 

Step-by-Step Solution  

1. Recall  implies  ➔ .  

2. The only Quadrant I angle with equal sine and cosine values is .  

 

Option Analysis  

30°: Incorrect (

Click "Show Answer" to reveal the answer and analysis