3. every triangle have three sides
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A regular polygon is a shape in which all angles are equal. An isosceles triangle has two equal sides, thus two equal angles, but the other side/angle differs. Therefore an isosceles triangle is not a regular polygon.
A triangle - any triangle - has 3 sides.
A triangle has three sides !
A triangle has 3 sides and no vertices.
Every triangle has 3 sides but with a equilateral triangle all sides are equal