Mirror and reflection symmetry (Spegling och symmetri)

Ämne / Topic

Mirror and reflection symmetry including identifying and drawing symmetrical pictures.

Inlärningsmål / Learning Goals

Understand mirror and rotational symmetry.

Google Slides & Videos

Lektionssteg / Steps in the lesson:

1. Lektionsuppvärmning / Lesson warm up / Hook / Review from previous lesson

Watch "Why do mirrors flip horizontally" video

2. Introduktion till lektionen / Introduction to the lesson content

Z book video

Symmetry

Some 2D shapes have lines of symmetry and rotational symmetry.

Line of symmetry – This is a line that you can draw through a shape such that what you see on one side of that line is a “mirror-image” of what you see on the other side.

Rotational symmetry – The order of rotational symmetry of a shape is the number of times the shape can be rotated and still look the same.

Line of Symmetry

3. Aktiviteter / Key Activities

4. Kolla vad eleverna kan / Check for understanding / Exit ticket

5. Stängning / Closure / Summary of lesson

Review of terminology

Lines of Symmetry in Regular Polygons

The number of lines of symmetry in a regular polygon is equal to the number of sides.

Rotational symmetry

The order of rotational symmetry of a shape is the number of times the shape can be rotated and still look the same.