Geometry

Question Analysis  

Determine the -coordinate on the unit circle for an angle in Quadrant I with , using the Pythagorean theorem and properties of 45-45-90 triangles.  

 

Key Concept Explanation  

Unit Circle Equation: .  

 

Step-by-Step Solution  

1. Substitute into the unit circle equation:  

2. Simplify:  

y > 0

 

Option Analysis  

: Correct (matches

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