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Symmetry Line Symmetry Rotational (Order) Symmetry Translational Symmetry www.mathsrevision.com Creating Rotational Symmetry MTH 2-19a MTH 3-19a.

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Presentation on theme: "Symmetry Line Symmetry Rotational (Order) Symmetry Translational Symmetry www.mathsrevision.com Creating Rotational Symmetry MTH 2-19a MTH 3-19a."— Presentation transcript:

1 Symmetry Line Symmetry Rotational (Order) Symmetry Translational Symmetry www.mathsrevision.com Creating Rotational Symmetry MTH 2-19a MTH 3-19a

2 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 Q4.Convert to 24 hrs clock MTH 2-19a MTH 3-19a

3 Line Symmetry www.mathsrevision.com Learning Intention Success Criteria 1.Understand the term line symmetry. 1.To revise line symmetry. 2.Complete Drawings given the line of symmetry. MTH 2-19a MTH 3-19a

4 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. MTH 2-19a MTH 3-19a

5 Line Symmetry The Square www.mathsrevision.com MTH 2-19a MTH 3-19a

6 Line Symmetry The rectangle www.mathsrevision.com MTH 2-19a MTH 3-19a

7 Line Symmetry The square www.mathsrevision.com MTH 2-19a MTH 3-19a

8 Line Symmetry The Rhombus www.mathsrevision.com MTH 2-19a MTH 3-19a

9 Line Symmetry The Parallelogram www.mathsrevision.com No lines of symmetry ! MTH 2-19a MTH 3-19a

10 Line Symmetry The Equilateral Triangle www.mathsrevision.com MTH 2-19a MTH 3-19a

11 Line Symmetry The Trapezium 1 www.mathsrevision.com MTH 2-19a MTH 3-19a

12 Line Symmetry The Trapezium 2 www.mathsrevision.com No lines of symmetry ! MTH 2-19a MTH 3-19a

13 Line Symmetry The Hexagonal www.mathsrevision.com MTH 2-19a MTH 3-19a

14 Line Symmetry www.mathsrevision.com Example : Complete the rest of the shape given the line of symmetry. MTH 2-19a MTH 3-19a

15 www.mathsrevision.com Your turn ! Exercise 1 Page 81 Creating Half-Turn Symmetry MTH 2-19a MTH 3-19a

16 Starter Questions www.mathsrevision.com Q1.Round the following to the first decimal place. Q2.What fraction is the green area. What fraction is the grey area. Q3.A pencil costs 22p. How much does a 1000 cost. Put your answer in £s. (a) 153.37(b)261.55 MTH 2-19a MTH 3-19a

17 Rotational Symmetry www.mathsrevision.com Learning Intention Success Criteria 1.Understand the terms rotational symmetry. 1.We are learning what rotational symmetry is for a shape. MTH 2-19a MTH 3-19a

18 www.mathsrevision.com Rotational Symmetry This new shape has HALF - TURN symmetry This dot is called the centre of symmetry 2.Use the tracing paper to make a copy of this shape. 3.Turn the tracing paper through 180 degrees about the dot. 1. Draw this shape into your jotter. MTH 2-19a MTH 3-19a

19 www.mathsrevision.com Rotation Symmetry Half Turn All these shapes have order 2 MTH 2-19a MTH 3-19a

20 www.mathsrevision.com Rotation Symmetry Order Has order 2 Has order 3 Has order 4 The order of symmetry is the number of times a shape looks the same in one complete turn. MTH 2-19a MTH 3-19a

21 www.mathsrevision.com Your turn ! Exercise 2 Page 82 Rotational Symmetry MTH 2-19a MTH 3-19a

22 Starter Questions www.mathsrevision.com Q1.Calculate Q4.Find the perimeter and area of the square. Q3. Q2.What is the time difference between 8.15am and 1:00pm Q5.Find the order of rotational symmetry for the shape opposite. 5cm 1 32 4 5 6 A=25cm 2 P=20cm MTH 2-19a MTH 3-19a

23 Creating Half-Turn Symmetry www.mathsrevision.com Learning Intention Success Criteria 1.Understand the terms half-turn symmetry. 1.We are learning how we can create half-turn symmetry for a shape. 2.Draw the other half of a shape such that it has half-turn symmetry. MTH 2-19a MTH 3-19a

24 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 MTH 2-19a MTH 3-19a

25 www.mathsrevision.com Creating Half-Turn Symmetry 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. Task 3 Do the same for this shape MTH 2-19a MTH 3-19a

26 www.mathsrevision.com Your turn ! Exercise 3 Page 85 Creating Half-Turn Symmetry MTH 2-19a MTH 3-19a

27 Starter Questions Starter Questions www.mathsrevision.com Q1.Calculate Q4.(-2) + (-3) Q3. Q2.What is the time difference between 8.15am and 1:00pm Q5.How many lines of symmetry does regular hexagon have. MTH 2-19a MTH 3-19a

28 Translational (slide) Symmetry www.mathsrevision.com Learning Intention Success Criteria 1.Understand the terms translational, slide congruent and tile. 1.We are learning the meaning of Translational (slide) symmetry using tile patterns. 2.Identify shapes that tile. 3.Construct a tile pattern for shapes. MTH 2-19a MTH 3-19a

29 www.mathsrevision.com Translational (slide) Symmetry A shape that tiles can be completely surrounded by congruent shapes WITHOUT leaving any gaps. Exactly the same shape and size ! MTH 2-19a MTH 3-19a

30 www.mathsrevision.com Translational (slide) Symmetry Is this a tile pattern ? No because there are gaps MTH 2-19a MTH 3-19a

31 www.mathsrevision.com Translational (slide) Symmetry Write down as many tile patterns as you can that you see every day. MTH 2-19a MTH 3-19a

32 www.mathsrevision.com Your turn ! Exercise 4 Page 87 Translational (slide) Symmetry MTH 2-19a MTH 3-19a


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