2D & 3D Shapes · B3 Mathematics

Lesson notes

Learning Objectives

Indicator: B3.3.1.1.2 - Draw and identify angles

By the end of the lesson, learners can:

identify an angle as the space formed where two lines or sides meet at a point called the vertex.
name the parts of an angle (vertex, arms/rays) when shown a diagram.
state whether a given angle is greater than, less than, or equal to a right angle using a paper square corner as a reference.
draw angles of different sizes (small, large, and right) using a ruler and a paper square corner.
sort angles into groups (right, less than right, greater than right) and justify their sorting.

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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: B3.3.1.1.2 - Draw and identify angles
Suggested placement: Term 2, Week 12 (Week 24 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. Sort 2D shapes into larger categories (e.g. rhombuses, rectangles and squares are all four-sided shapes.) according to a common, shared attribute and justify sorting; Draw examples of shapes that belong to and those that do not belong to given category
E.g. 2. Measure the sides of a given polygon; Draw a polygon with given sides