2D & 3D Shapes · B3 Mathematics

Lesson notes

Learning Objectives

Indicator: B3.3.1.1.1 - Describe 3D objects according to the shape of the faces, the number of edges and vertices. Sort regular and irregular polygons including triangles, quadrilaterals, pentagons, heptagons according to the number of sides

By the end of the lesson, learners can:

Identify and name common 3D objects (cube, cuboid, cylinder, cone, sphere, pyramid, prism) from physical models and pictures.
Count and state the number of faces, edges, and vertices of a given 3D object, and describe the shape of each face (e.g., square, rectangle, triangle, circle).
Sort a collection of 3D objects according to a chosen attribute (number of faces, number of edges, number of vertices, or shape of faces) and explain the sorting rule used.
Identify regular and irregular 2D shapes (triangles, quadrilaterals, pentagons, hexagons, heptagons) by counting their sides, regardless of size or orientation.
Sort 2D polygons according to the number of sides and justify their grouping using precise mathematical language (sides, vertices, regular, irregular).

Sign in with your phone number to read the full note and download the GES plan - free.

Sign in with phone number

Curriculum details

Strand: Geometry and Measurement (Strand 3)
Sub-strand: 2D & 3D Shapes (3.1)
Content standard: B3.3.1.1 - Analyse the relationships among and between 2-D shapes and 3-D objects according to a variety of attributes, including measurement
Indicator: B3.3.1.1.1 - Describe 3D objects according to the shape of the faces, the number of edges and vertices. Sort regular and irregular polygons including triangles, quadrilaterals, pentagons, heptagons according to the number of sides
Suggested placement: Term 2, Week 11 (Week 23 of the year)
Our suggestion, laid out in curriculum order across three terms of twelve weeks. NaCCA does not fix the week, so follow your school's scheme of learning.
Curriculum reference: Mathematics Curriculum for Primary Schools (Basic 1-3), 2019, p. 64
Transcribed from the official NaCCA publication. Check this page against the source.

Exemplars (from the NaCCA curriculum)

E.g. 1. Identify a variety of 3D shapes (cubes, spheres, cones, cylinders, pyramids and prisms) by:
- identifying and counting the faces, edges and vertices:
- describing the shape of the faces
- constructing a skeleton of an object and describing the relationship between the skeleton and the object
E.g. 2. Sort a collection of 3D objects according to the number/nature of faces, number of edges or number of vertices and describe sorting rule used
E.g. 3. Identify regular and irregular 2D shapes (triangles, rhombus, rectangles, squares, pentagons, hexagons, octagons) having different dimensions and orientations by the number and nature of sides