The smallest number of triangles that you could divide a nonagon into is seven.
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Two Isosceles triangles.__ ^/ / / |/ / / |V --
You need at least four triangles, or at least three trapeziums. Or two triangles and one trapezium.
All triangles need at least two acute angles
the answer is three i say that because triangles are pointy there are three points an there all closed so its 3 angles
only right tringles or HL triangles have at least 1 right angle