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The odd one out is the cube which is a 3D shape whereas the rest are 2D shapes if that is your question.

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A random collection of geometric shapes in 2- and 3-dimensional space.

Q: Square Triangle Pentagon Hexagon Cube Octagon?

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An equilateral triangle, a square, a hexagon, a pentagon, a decagon, an octagon, the list goes on and on.

Octagon.

triangle

Why

We have the triangle (3-sided), square (or quadrilateral, 4-sided), pentagon (5-sided), hexagon (6-sided), heptagon (or septagon, 7-sided), octagon (8-sided), nonagon (9-sided) and decagon (10-sided) to get you started.

Related questions

Triangle

A straight line, a triangle, an octagon, a pentagon, a hexagon a square a rectangle a.........

triangle circle square octagon pentagon hexagon trapezoid

They are a miscellaneous collection of polygons.

An equilateral triangle, a square, a hexagon, a pentagon, a decagon, an octagon, the list goes on and on.

Octagon.

Of the four shapes mentioned, the octagon has the most sides. Square has 4 sides, hexagon has 6, pentagon has 5, and the octagon has 8.

triangle

What about on ?TrianglE, SquarE, PentagoN, HexagoN, HeptagoN, OctagoN.

Square

Why

Geometric figures in a plane can be 3-sided (triangle), 4-sided (square, rectangle, or, in general, quadrilateral), 5-sided (pentagon), 6-sided (hexagon), 7-sided (heptagon or septagon), 8-sided (octagon) and on and on in the polygons.