Solution
If figure is in shape of square and two diagonals are there then total numer of triangles is always 8
So, ABCD and CBFG have 8 and 8 triangles means total 16 triangles.
Now, Remaining triangles = BIJ, IJF, BJF, DBG, ACF
Total number of triangles = 8 + 8 + 5 = 21.
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