Yep 
The triangles array you fill with the Vertex array index, 3 entries for each triangle. So for a simple quad, 4 vertices, 2 triangles = six entries in triangles array.
Yep The triangles array you fill with the Vertex array index, 3 entries for each triangle. So for a simple quad, 4 vertices, 2 triangles = six entries in triangles array.