Geometry

Question Analysis  

Identify the false statement about the unit circle, focusing on definitions and special angle coordinates.  

Key Concept Explanation  

Unit Circle Basics:  

Radius = 1.  

-coordinate, -coordinate.  

Special angles:  

:  (equal x and y).  

:  (x = , not ).  

Step-by-Step Solution  

1. Analyze each option:  

A: True (unit circle definition).  

B: True (-coordinate).  

C: True ( has equal x and y).  

D: False ( x-coordinate is , not ;  is the x-coordinate for ).  

Common Mistakes  

Confusing x-coordinates of

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