1. Contains an infinite number of points
2. can be used to create other geometric shapes
3. is a term that does not have a formal definition
In Geometry, unless it's stated, a line will extend in one dimension and goes on forever in both ways.
The simplest triangles are AEH, EHI, EBF, EFI, FGC, IFG, DGH and HIG i.e. 8 in number.
The triangles composed of two components each are HEF, EFG, HFG and EFG i.e. 4 in number.
Thus, there are 8 + 4 = 12 triangles in the figure.
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