Answer:
- Regular polygon: D
- Irregular polygon: A, C, E
- Neither: B
Explanation:
You want to identify the regular polygons among the figures shown.
Polygon
A polygon is a closed figure whose sides are straight lines.
Figure B is not a polygon.
Regular polygon
A regular polygon is a convex polygon whose sides are congruent, and whose interior angles are congruent.
Figure D is a regular polygon. (The sides and angles are marked congruent)
Figures A, C, E are irregular polygons.
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Additional comment
A regular polygon's vertices are equally spaced around its circumscribing circle.
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