Question

identify the figure that is not a polygon.

regular hexagon

equilateral triangle

scalene triangle

straight line

Explanation:

Step1: Recall polygon definition

A polygon is a closed figure with at least 3 straight sides.

Step2: Analyze each option

• Regular hexagon: Closed, 6 straight sides → polygon.
• Equilateral triangle: Closed, 3 straight sides → polygon.
• Scalene triangle: Closed, 3 straight sides → polygon.
• Straight line: Not closed, 1 straight line (no sides forming a closed figure) → not a polygon.

Answer:

D. Straight line