because you can't just change one of the angles or one of the side lengths without breaking the triangle. All the angles and sides re-inforce each other. Image a square made out of sticks that are attached loosely at the corners. You can squish two of the corners together to make a diamond shape, and you haven't changed the length of the sides. But if you have a triangle made out of sticks, you can't change it's shape without destroying it.
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A triangle is a 3 sided polygon
A triangle is a polygon, though trigon is an alternative name for a 3 sided polygon.
A triangle is a polygon with 3 sides
No, only an equilateral triangle is a rgular polygon.
Triangle