Symmetry Line Symmetry Rotational (Order) Symmetry www.mathsrevision.com Creating Rotational Symmetry

Starter Questions www.mathsrevision.com Q1. Calculate Q2. If 1 bar of chocolate costs 65p. How much will 1000 bars cost. Give your answer in £’s. Q3. Round to 1 decimal place www.mathsrevision.com Q4. Covert to 24 hrs clock

Line Symmetry www.mathsrevision.com Learning Intention Success Criteria To revise line symmetry. Understand the term line symmetry. Complete Drawings given the line of symmetry. www.mathsrevision.com

Line Symmetry www.mathsrevision.com A line symmetry occurs in a shape if, when the shape is folded over the line the two pieces either side of the line, are exactly the same. www.mathsrevision.com

Line Symmetry The Square www.mathsrevision.com

Line Symmetry The rectangle www.mathsrevision.com

Line Symmetry The Kite S4 www.mathsrevision.com

Line Symmetry The Rhombus www.mathsrevision.com

Line Symmetry The Parallelogram www.mathsrevision.com No lines of symmetry !

Line Symmetry The Equilateral Triangle www.mathsrevision.com

Line Symmetry The Trapezium 1 www.mathsrevision.com

Line Symmetry The Trapezium 2 No lines of symmetry ! www.mathsrevision.com

Line Symmetry The Hexagonal www.mathsrevision.com

Line Symmetry www.mathsrevision.com Example : Complete the rest of the shape given the line of symmetry. www.mathsrevision.com

Created by Mr. Lafferty Maths Dept. Line Symmetry S4 Now try MIA Ex1 Ch3 (page 33) www.mathsrevision.com 19-Apr-17 Created by Mr. Lafferty Maths Dept.

Starter Questions www.mathsrevision.com Q1. Round the following to the first decimal place. (a) 153.37 (b) 261.55 Q2. What fraction is the green area. What fraction is the grey area. www.mathsrevision.com Q3. A pencil costs 22p. How much does a 1000 cost. Put your answer in £’s.

Rotational Symmetry www.mathsrevision.com Learning Intention Success Criteria To explain rotational symmetry for a shape. Understand the terms rotational symmetry. www.mathsrevision.com

Rotational Symmetry www.mathsrevision.com 1. Draw this shape into your jotter. 2. Use the tracing paper to make a copy of this shape. 3. Turn the tracing paper through 180 degrees about the dot. www.mathsrevision.com This new shape has HALF - TURN symmetry This dot is called the centre of symmetry

Rotation Symmetry Half Turn www.mathsrevision.com All these shapes have order 2

Rotation Symmetry Order The order of symmetry is the number of times a shape looks the same in one complete turn. Has order 2 www.mathsrevision.com Has order 3 Has order 4

Created by Mr. Lafferty Maths Dept. Rotational Symmetry S4 Now try MIA Ex2 Ch3 (page 36) www.mathsrevision.com 19-Apr-17 Created by Mr. Lafferty Maths Dept.

Starter Questions www.mathsrevision.com Q1. Calculate Q2. What is the time difference between 8.15am and 1:00pm P=20cm Q3. A=25cm2 www.mathsrevision.com 5cm Q4. Find the perimeter and area of the square. Q5. Find the order of rotational symmetry for the shape opposite. 5 6 1 4 3 2

Creating Half-Turn Symmetry Learning Intention Success Criteria To explain how we can create half-turn symmetry for a shape. Understand the terms half-turn symmetry. Draw the other half of a shape such that it has half-turn symmetry. www.mathsrevision.com

Creating Half-Turn Symmetry Task 1 Draw the complete shape you get after it has been rotated through 180 degrees about the point. Task 2 Do the same for this shape www.mathsrevision.com

Creating Half-Turn Symmetry Task 3 Do the same for this shape www.mathsrevision.com If you find it difficult to work out the new shape 1. Try tracing the shape first 2. Then rotate tracing paper 180 deg about the point.

Creating Half-Turn Symmetry Now try MIA Ex3 Ch3 (page 38) www.mathsrevision.com 19-Apr-17 Created by Mr. Lafferty Maths Dept.