wunder beta⬡ Regular and Irregular Polygons
Name polygons by their sides and tell regular shapes (equal sides and angles) from irregular ones.
2
lessons
~15 min
to learn
🔢 Math
subject
Ages 6–12
level
What you’ll learn
- What Makes a PolygonRecognise polygons as closed straight-sided shapes and name them by their number of sides.A polygon is a flat, closed shape made only of straight sides, so circles and semicircles are not polygons. We name polygons by side count: 3 a triangle, 4 a quadrilateral, 5 a pentagon, 6 a hexagon, 8 an octagon.
- Regular or IrregularTell regular polygons (equal sides and angles) from irregular ones.A regular polygon has all sides equal AND all angles equal, like a square or equilateral triangle. If even one side or angle is different — like in a rectangle or a wonky pentagon — the polygon is irregular.
Questions this course answers
Which of these is NOT a polygon?
A circle has a curved edge, so it is not a polygon.
A stop sign has 8 sides, so it is a...
Eight sides make an octagon, like a stop sign.
A regular polygon must have...
Regular polygons need both equal sides and equal angles.
Why is a long rectangle an irregular polygon?
A rectangle's sides are not all equal, so it is irregular.
Which shape is regular?
An equilateral triangle has equal sides and equal angles, so it is regular.
Grounded in trusted sources
- Khan Academy Kids
- BBC Bitesize KS2 Maths
- NRICH Maths (Cambridge)
- Britannica Kids
- National Council of Teachers of Mathematics
Every Wunder lesson is built from real, reputable sources — never invented.
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