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?

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

QUIZ

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.

LINE SYMMETRYROTATIONAL SYMMETRY

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.

HOW MANY LINES OF SYMMETRY?

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 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.

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: Order 4 Order 1 Order 2 Order 5 Order 2 Order 4 Order 6 Order 3 Order 5 Order 4 Order 3 Order 1