Providing that it is a regular octagon then it will have 8 sides
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A shape has three sides if its interior angles add up to equal 180 degrees.
If you mean number of sides then a rhombus is a 4 sided quadrilateral with equal sides with 2 equal opposite acute angles and 2 equal obtuse angles whereas its 4 interior angles add up to 360 degrees.
Because; (number of sides-2)*180 = sum of interior angles
Triangle has 3 sides, 3 vertices (corners) whose interior angles add up to 180. Octagon has 8 sides, 8 vertices, whose interior angles add up to 1080 degrees. A regular triangle (all sides equal, all angles equal), has interior angles of 60 degrees. A regular octagon (all sides equal all angles equal), has interior angles of 135.
No. Sides cannot equal 360 degrees since they are not measured in degrees. The sum of the [interior] angles depends on the number of sides.