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All triangles have 3 sides.
This depends on the polygon.For a triangle (3-sides) : maximum 1 obtuse angle.Quadrialteral (4-sides): maximum 3 obtuse angles.For polygons with more sides, it is possible for all angles to be obtuse.
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By definition, all triangles have 3 sides.
None normally but if it is in the shape of an isosceles triangle then it will have 2 equal sides.