Question

which shape is not sorted correctly in the graphic organizer?
two-dimensional figures
semicircle crescent
polygons
triangle pentagon quadrilateral circle
options:
① circle
② pentagon
③ quadrilateral
④ triangle

Explanation:

Step1: Recall polygon definition

A polygon is a closed figure with straight sides.

Step2: Analyze each shape

• Triangle: 3 straight sides, polygon.
• Pentagon: 5 straight sides, polygon.
• Quadrilateral: 4 straight sides, polygon.
• Circle: Curved boundary, not a polygon. But it's placed in "Polygons" section.

Answer:

A. Circle