Geometry

Question Analysis:  
This question tests the first move when starting a coordinate proof.  
The main focus is on following correct procedural steps.

Key Concept Explanation:  
Coordinate proofs should begin with a clear sketch, placed simply on the Cartesian plane.

Step-by-Step Solution:  
Sketching simplifies future calculations of slope, distance, and midpoints.

Option Analysis:  
- A. Calculations come after sketching.  
- B. Correct. Always start with a sketch.  
- C. Full a...