No, a pentagon has five sides. An octagon has eight sides.
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An octagon has 8 sides and a pentagon has 5 sides so it follows that 8+5 = 13 sides
3 sides more because an octagon has 8 sides and a pentagon has 5 sides.
Pentagon has 5 sides, octagon has 8.
An Octagon has 8 sides. The other more popular shapes are Hexagon which has 6 sides, a Pentagon which has 5 sides, a Square which has 4 sides and a Triangle which has 3 sides.
An octagon has more sides and angles than a pentagon. An octagon is a polygon with eight sides and eight angles and a pentagon is a polygon with five sides and five angles.