2D & 3D Shapes · B3 Mathematics

Lesson notes

Indicator: B3.3.1.1.3 - Use cut-out paper as a square corner to determine angles which are right angles and angles which are not right angles

By the end of the lesson, learners can:

Create a square corner by cutting or folding paper, following the teacher’s demonstration.
Identify right angles and non-right angles in 2D shapes and objects in the classroom and around the school compound.
Use a paper square corner to test whether a given angle is a right angle or not, and explain their reasoning.
Sort polygons into two groups: those with square corners and those without square corners.
Justify their classification of angles by placing the paper corner directly on the angle and explaining what they observe.

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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: B3.3.1.1.3 - Use cut-out paper as a square corner to determine angles which are right angles and angles which are not right angles
Suggested placement: Term 3, Week 1 (Week 25 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. 65
Transcribed from the official NaCCA publication. Check this page against the source.

E.g. 1. Identify polygons with square corners and those without square corners in and around their environment using cut-out papers