# Reflective symmetry in 2D shapes

#### What's Included

• Smart Notebooks Presentation
• Activ Inspire Flipchart
• Lesson Plan
• Microsoft PowerPoint Presentation
• Differentiated Worksheet

# Reflective symmetry in 2D shapes

Students learn how to describe reflective symmetry in 2D shapes using mirror lines.  Learning progresses from finding the lines of symmetry in simple polygons to reflecting shapes in diagonal mirror lines.

The start of the lesson recaps identifying the properties of quadrilaterals using coordinates in the first quadrant.  In the plenary students are challenged to create a series of quadrilaterals with different reflective symmetries when three vertices are fixed.

##### Differentiated Learning Objectives
• All students should be able to identify lines of symmetry in 2D shapes.
• Most students should be able to describe and sketch polygons that are reflectively symmetric.
• Some students should be able to describe and sketch 2D shapes that are reflectively symmetric.
Transformations and Symmetry

### Mr Mathematics Blog

#### Teaching Mathematics for a Growth Mindset

Inspiring students to enjoy maths and feel the success that comes with attempting a difficult challenge is why I teach.  The feeling of success is addictive.  The more students experience it the more they want it and the further out of their comfort zone they are willing to go to get more of it.  Teaching […]

#### Equation of Straight Line Graphs

To find the equation of straight line graphs students need to calculate the gradient using two pairs of coordinates and the intercept which is the y value of where it crosses the vertical axis.  Examiner’s reports of past exam questions show students are more able to find the intercept of a straight line than they […]

#### Arithmetic and Geometric Sequences

Students learn how to generate and describe arithmetic and geometric sequences on a  position-to-term basis.  Learning progresses from plotting and reading coordinates in the first quadrant to describing geometric sequences using the nth term. This unit takes place in Term 4 of Year 10 and is followed by the equations of straight line graphs. Arithmetic […]