2D Shapes for Grade 2 – Understanding Polygons | CuriousEd.ai

This Grade 2 geometry lesson from CuriousEd.ai introduces students to 2D shapes and their properties. Learners explore circles, triangles, squares, rectangles, pentagons, and hexagons while understanding sides and vertices. The resource also explains the difference between regular and irregular polygons, helping children build strong foundational skills in geometry and the Cambridge Primary Mathematics curriculum.

1. 2Dshapes
© 2025 CuriousEd.ai​

2. Objective
•3Gg.01Identify,describe,classify,nameandsketch2Dshapes
bytheirproperties.Differentiatebetweenregularandirregular
polygons.
© 2025 CuriousEd.ai​

3. 2Dshapes
•2Dshapesareplanefigures
andtheyhaveflatsurface.
•A2Dshapecannotbeheld.
•Theyhaveonlytwo
dimensions:lengthandwidth.
© 2025 CuriousEd.ai​
Circle
Rectangle
Pentagon Hexagon
Triangle
Square

4. Propertiesofatriangle
•Thereare3sidesand3verticesinatriangle.
© 2025 CuriousEd.ai​

5. Propertiesofasquare
•Thereare4sidesand4verticesinasquare.
© 2025 CuriousEd.ai​

6. Propertiesofarectangle
•Thereare4sidesand4verticesinarectangle.
© 2025 CuriousEd.ai​

7. Propertiesofapentagon
•Thereare5sidesand5verticesinapentagon.
© 2025 CuriousEd.ai​

8. Propertiesofahexagon
•Thereare6sidesand6verticesinahexagon.
© 2025 CuriousEd.ai​

9. Polygon
•Apolygonisaclosedshape
with3ormorestraightsides.
•Examples:Triangle,square,
etc.
•Note:Acircleisnotapolygon
becauseithasnostraight
sides.
© 2025 CuriousEd.ai​
Triangle
Square

10. Typesofpolygons
Regularpolygon
•Ifallthesidesofapolygon
areequal,thenitiscalleda
regularpolygon.
•Examples:square,regular
pentagon,etc.
Irregularpolygon
•Irregularpolygonsdonot
sideswithequallength.
•Example:rectangle,
irregularpentagon,etc.
© 2025 CuriousEd.ai​

11. Regularpolygons
© 2025 CuriousEd.ai​
•Alltheseshapeshavesidesofequallength.
•Sotheyarecalledregularpolygons.

12. Irregularpolygons
© 2025 CuriousEd.ai​
•Alltheseshapeshavesidesofdifferentlengths.
•Sotheyarecalledirregularpolygons.

13. Thankyou
© 2025 CuriousEd.ai​