Classification – Odd one out (geometry: dimension mismatch) In three pairs, the first term is a 2-D figure and the second is its standard sub-part or constituent (arc of a circle, angle of a polygon, line/side of a square). One pair mixes 1-D and 0-D in a different way. Identify the odd pair.

Introduction / Context:
Geometric classifications often rely on consistent figure→sub-part relations within the same dimensional regime. Here, three entries pair a 2-D figure with a standard 1-D sub-feature (arc, side/line segment, angle as a constituent). The remaining pair is a 1-D object with a 0-D element, which breaks the pattern.

Given Data / Assumptions:

• Circle : Arc → 2-D figure with a 1-D sub-part (arc on circumference)
• Hexagon : Angle → 2-D polygon with internal angles
• Square : Line → 2-D polygon with sides (line segments)
• Line : Dot → 1-D object with 0-D element (point)

Concept / Approach:
Group by the dimensional nature of the first term and the role of the second. Select the pair that does not maintain the “2-D figure → its canonical sub-part” pattern.

Step-by-Step Solution:
Circle : Arc → consistent.Hexagon : Angle → consistent.Square : Line → consistent (line segment/side).Line : Dot → dimensionally different; not a 2-D figure → odd.

Verification / Alternative check:
Attempt to phrase each as “part of the boundary or interior of the 2-D figure.” This phrasing works for circle/hexagon/square pairs, not for “line : dot.”

Why Other Options Are Wrong:

• Circle : Arc → valid constituent relation.
• Hexagon : Angle → valid constituent relation.
• Square : Line → valid constituent relation.
• None of these → one clear dimensional mismatch exists (Line : Dot).

Common Pitfalls:
Over-generalizing “a line is made of points.” While true, the test’s intended uniformity is “2-D figure → standard sub-part,” which “line : dot” breaks.

Final Answer:
Line : Dot