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WARM UP FEBRUARY 5, 2014 1.What is the scale factor of the line AB? A(4,8) B(3, 9) A(2, 4) B(3/2, 9/2) 2. What two transformations create a glide reflection?

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Presentation on theme: "WARM UP FEBRUARY 5, 2014 1.What is the scale factor of the line AB? A(4,8) B(3, 9) A(2, 4) B(3/2, 9/2) 2. What two transformations create a glide reflection?"— Presentation transcript:

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2 WARM UP FEBRUARY 5, What is the scale factor of the line AB? A(4,8) B(3, 9) A(2, 4) B(3/2, 9/2) 2. What two transformations create a glide reflection?

3 EOCT The points (0,1), (1,5), (2, 25), (3, 125) are on the graph of a function. Which equation represents that function?

4 QUIZ

5 Symmetry A figure has symmetry if a transformation occurs and the image coincides with the preimage. There are two types of symmetry which we will look at line symmetry and rotational symmetry.

6 LINE SYMMETRYROTATIONAL SYMMETRY

7 LINE SYMMETRY A figure has line symmetry if it can be reflected across a line so that the image coincides with the preimage. The line of symmetry is the line that divides the figure into two congruent halves.

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9 HOW MANY LINES OF SYMMETRY?

10 Rotational Symmetry All 2 dimensional shapes have some rotational symmetry. The degree of rotational symmetry that an object has is known as its order. Order 1 Order 2 Order 3 Order 4 For shapes that have order 2 rotational symmetry or higher, a single centre of rotation can be located. For shapes that have only order 1 rotational symmetry a centre of rotation can be found anywhere within it. The order of rotational symmetry that an object has is the number of times that it fits on to itself during a full rotation of 360 degrees.

11 Rotational Symmetry Order Order Order Order 4 The order of rotational symmetry that an object has is the number of times that it fits on to itself during a full rotation of 360 degrees.

12 Equilateral Triangle An equilateral triangle has rotational symmetry of order ? 3

13 Square A square has rotational symmetry of order ? 4

14 Isos Tri 1 1 Isosceles Triangle An isosceles triangle has rotational symmetry of order ?

15 1 1 Scalene Triangle An scalene triangle has rotational symmetry of order ?

16 Questio ns 2 Rotational Symmetry State the order of rotational symmetry for each shape below: Order 4 Order 1 Order 2 Order 5 Order 2 Order 4 Order 6 Order 3 Order 5 Order 4 Order 3 Order 1

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