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The walls of a living room are painted with identical triangular patterns. One such triangle has the vertices \((- 3, 0)\), \((- 10, -8)\) and \((6, 7)\). If the walls of the room are entirely covered by 117 triangles, then find the area of the walls.
 
tri pattern.jpg
 
Answer:
 
Area of the walls \(=\)  square units.