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Symmetry

S4. Symmetry. Line Symmetry. Rotational (Order) Symmetry. www.mathsrevision.com. Creating Rotational Symmetry. S4. Starter Questions. 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.

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Symmetry

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  1. S4 Symmetry Line Symmetry Rotational (Order) Symmetry www.mathsrevision.com Creating Rotational Symmetry

  2. S4 Starter Questions 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

  3. S4 Line Symmetry Learning Intention Success Criteria • Understand the term line symmetry. • To revise line symmetry. • Complete Drawings given the line of symmetry. www.mathsrevision.com

  4. S4 Line Symmetry 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

  5. S4 Line SymmetryThe Square www.mathsrevision.com

  6. S4 Line SymmetryThe rectangle www.mathsrevision.com

  7. S4 Line SymmetryThe Kite www.mathsrevision.com

  8. S4 Line SymmetryThe Rhombus www.mathsrevision.com

  9. S4 Line SymmetryThe Parallelogram www.mathsrevision.com No lines of symmetry !

  10. S4 Line SymmetryThe Equilateral Triangle www.mathsrevision.com

  11. S4 Line SymmetryThe Trapezium 1 www.mathsrevision.com

  12. S4 Line SymmetryThe Trapezium 2 No lines of symmetry ! www.mathsrevision.com

  13. S4 Line SymmetryThe Hexagonal www.mathsrevision.com

  14. S4 Line Symmetry Example : Complete the rest of the shape given the line of symmetry. www.mathsrevision.com

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

  16. S4 Starter Questions 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.

  17. S4 Rotational Symmetry Learning Intention Success Criteria • Understand the terms rotational symmetry. • To explain rotational symmetry for a shape. www.mathsrevision.com

  18. Rotational Symmetry S4 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

  19. Rotation Symmetry Half Turn S4 www.mathsrevision.com All these shapes have order 2

  20. Rotation Symmetry Order S4 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

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

  22. S4 Starter Questions 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. 6 5 1 4 3 2

  23. S4 Creating Half-TurnSymmetry Learning Intention Success Criteria • Understand the terms half-turn symmetry. • To explain how we can • create half-turn symmetry for a shape. • Draw the other half of a shape such that it has half-turn symmetry. www.mathsrevision.com

  24. Creating Half-TurnSymmetry S4 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

  25. Creating Half-TurnSymmetry S4 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.

  26. Creating Half-TurnSymmetry S4 Now try MIA Ex3 Ch3 (page 38) www.mathsrevision.com Created by Mr. Lafferty Maths Dept.

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