## Triangles

Grade | Work Samples |
---|---|

End of Stage 3 (end of Year 6) | |

Grade A | Alex |

Grade B | Rania |

## Foundation Statement strands

*The following strands are covered in this activity:*

Working Mathematically, Measurement and Data, Space and Geometry

## Description of activity

Students use a protractor and ruler to draw different triangles. They name the types of triangle drawn and explain how they are different.

- Students use a protractor and ruler to draw three different types of triangles.

- They name the type of triangle they have drawn.

- Students explain how the triangles are different from each other.

- They use appropriate mathematical terms when naming and explaining.

The suggested time allocation for this activity is 30 minutes.

## Suggested materials

Protractors, rulers, pencils, blank paper

## Prior learning

Students have had experience in measuring, labelling, constructing and naming various angles. They have investigated different types of triangles and their properties.

Board of Studies NSW, *Mathematics K–6 Syllabus, *pp 95, 128–129

Board of Studies NSW, *Mathematics K–6 Sample Units of Work, *p 149

## Outcomes

**Length (MS3.1)**

Selects and uses the appropriate unit and device to measure lengths, distances and perimeters

**Two-dimensional Space (SGS3.2a)**

Manipulates, classifies and draws two-dimensional shapes and describes side and angle properties

**Two-dimensional Space (SGS3.2b)**

Measures, constructs and classifies angles

**Applying Strategies (WMS3.2)**

Selects and applies appropriate problem-solving strategies, including technological applications, in undertaking investigations

**Communicating (WMS3.3)**

Describes and represents a mathematical situation in a variety of ways using mathematical terminology and some conventions

## Criteria for assessing learning

Students will be assessed on their ability to:

- use geometrical instruments to draw a variety of triangles
- classify triangles on the basis of their side and angle properties
- communicate mathematical ideas using mathematical terminology and/or diagrams