10 triangles
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Nine, as a n-gon can be cut in n-2 triangles.
Yes, you can but it take 3 triangles.
It needs only 2 triangles to construct a parallelogram
2 triangles make up a rhombus which has 4 interior angles adding to 360 degrees and a triangles has 3 interior angles add up to 180 degrees. Therefore: 360/180 = 2 triangles
10 sides and angles * * * * * A decagon need not have any equal sides. If it does have equal sides, their number can take any [integer] value in the range [2, 10].