exam Maths Puzzle Numerical Ability

Graph y=x-2

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I drew the pentagon and not sure if I found all the triangles, I found 20 is this right or are there more. Heres the question. Thanks for your help.

Draw a pentagon with each of its five diagonals. How many triangles are contained in the figure? Hello
index of 5 squrt. root of64x^12y^19