17. Find the area of the walls

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.

 

 

Answer:

 

Area of the walls \(=\)  square units.