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:
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.
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.
Rotational Symmetry Order 1 1 2 Order 2 1 2 3 Order 3 1 2 3 4 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.
Equilateral Triangle An equilateral triangle has rotational symmetry of order ? 3
Square A square has rotational symmetry of order ? 4
Isos Tri 1 1 Isosceles Triangle An isosceles triangle has rotational symmetry of order ?
1 1 Scalene Triangle An scalene triangle has rotational symmetry of order ?
Questio ns 2 Rotational Symmetry State the order of rotational symmetry for each shape below: 13 14 15 16 17 18 19 20 21 22 23 24 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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