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Question

Find the total number of triangles in the figure.
339395.jpg

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Solution

After labeling the figure, the triangles formed are:

ADE,ABE,BEF,BFC,CFG,DHI,DEI,EFI,FGI,IGJ,ADI,AHI,CIG,CIJ,ACI,DGI,EIG,DFI

Thus, there are 18 triangles.

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