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Polygons, interior angles and symmetry

Mathematics

Polygons, interior angles and symmetry

An AR classroom game for Grade 5. Learners can aim with their hands at the camera or play by tapping the screen.

This set has 6 questions in an interactive multiple choice activity.

Curriculum indicatorค 2.2 ป.5/1

PlayHost a classroom

A look before you play

Sample questions

A few real prompts from the game to help you choose an activity for your class.

  1. How many lines of symmetry does a regular hexagon have?

    • 6
    • 12
    • 3
    Read the explanation

    A regular hexagon has six lines of symmetry.

  2. Which shape has two pairs of parallel sides?

    • triangle
    • parallelogram
    • trapezium
    Read the explanation

    A parallelogram has both pairs of opposite sides parallel.

  3. How many pairs of parallel sides does a trapezium have?

    • 2
    • 0
    • 1
    Read the explanation

    A trapezium has just one pair of parallel sides.

Before you play

Game teaching guide

What children will practise

Name properties of polygons: lines of symmetry, how many pairs of parallel sides parallelograms and trapeziums have (linked to ค 2.2 ป.5/2), and interior angle totals by splitting into triangles.

What's in the worksheet

6 questions, multiple choice with 3 options - Lines of symmetry of a regular hexagon (6) - Which shape has two pairs of parallel sides (parallelogram) - Pairs of parallel sides in a trapezium (1) - Which shape's interior angles total 540 degrees (pentagon) - Lines of symmetry of an isosceles triangle (1)

How to use it in class

Use after classifying quadrilaterals, as a stretch game for confident pupils; about 6-8 minutes. - Play in teams and hand out paper hexagons and isosceles triangles to fold for real lines of symmetry - If many miss Q4 and Q6, draw diagonals from one corner of a pentagon on the board and count the 3 triangles - For Q1, have children fold rather than guess - Play it linked to the class to record results in the mark book.

Common sticking points

- Q1: children may answer 3, counting only lines through corners, or 12, counting lines twice - Q6: 900 or 540 come from miscounting triangles; the number of triangles is the number of sides minus 2 - Q2: the trapezium is a strong distractor, as children remember it has parallel sides but forget it has only one pair

Play together first, then build on it with a worksheet for the same level.

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