Year 8 Revision Bluesmartie14

Year 8 Topics Click on which topic you wish to revise Transformations Symmetry Reflection Translation Enlargement MINI EXAM Area Perimeter Circles Volume

Symmetry is where an object looks exactly the same when you place it in different positions. There are three types of symmetry. 1.Line Symmetry 2.Plane Symmetry 3.Rotational Symmetry Next Homepage

If you need help then please visit: Here you will learn about rotational symmetry as well. Homepage Next Line Symmetry Line symmetry is where you can draw a mirror line across a picture on both sides and it will fold exactly together. 1 line of symmetry NO lines of symmetry 1 line of symmetry

Homepage Worksheet on line symmetry Plane Symmetry For 2D shapes we call the mirror line, lines of symmetry. Whereas for 3D shapes we call the mirror line planes of symmetry. A plane mirror surface can e drawn through many solids, but the shape must be exactly the same on both sides. Here are a few examples:

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Homepage Rotational Symmetry Rotational Symmetry is where an object looks exactly the same when its rotated in different positions. Here are a few examples: Next

1. The order of rotational symmetry is practically a fancy way of saying: “how many times does it look the same in different positions”. 2. BUT… when a shape has only 1 rotational symmetry you can either say it has a rotational symmetry order 1 OR you could say it has NO lines of symmetry. Two KEY Points Homepage Next

PLEASE RETURN TO HOMEPAGE If you need help on this topic then please visit: metry/revision/1/ metry/revision/1/ OR For helpful videos visit: OR Homepage

Reflection is where you copy an image exactly the same in a different position. Just like you see yourself in a mirror etc. Here is an example: Next Homepage

Next Homepage Visit this link to watch an intelligent teacher explain how to reflect a shape:

TRACING PAPER MAY HELP!!! 1. For reflections, trace one side of the object including the mirror line. Then turn the paper over and line up the mirror line in its original position. 2. For rotations, just swizzle the tracing paper round. Its really useful for finding the centre of rotation and by doing this you are using the technique trial and error as well as the order of rotational symmetry. 3. You can use tracing paper in an exam-so if needed ASK! Homepage PLEASE RETURN TO HOMEPAGE

Translation is not where you translate a language into another. Its where you translate an object from one place to another making it look exactly the same! Here is an example: Next Homepage

PLEASE RETURN TO THE HOMEPAGE Homepage Please visit: formations1/revision/3/ for further acknowledgements for translations. This website is very trustful and it will help you a lot. After revision you may do the activity and test to see how well you have understood this topic. If you get more than 80% or above it’s a very good sign. formations1/revision/3/

Homepage Enlargement is where you make an object bigger or smaller. You do this by the help of the scale factor and the centre of enlargement. Look at the example below and visit this link: vision/3/ This link explains in full detail so you would understand it more easily by watching at least 3 times if you find it hard try this link as well: vision/3/ HELPFUL SECRET

For this whole topic the name TERRY would be very useful this stands for: T ranslation E nlargement R otation R eflection Y Homepage Next Translation You must only specify one detail: 1.The translation vector: How far it moves along the x-axis How far it moves up/down the y-axis

Homepage Next Enlargement You must only specify two detail: 1.The translation vector 2. The centre of enlargement Rotation You must only specify three detail: 1. Angle turned 2. Direction (clockwise/anticlockwise) 3. Centre of rotation Reflection You must only specify one detail: 1.The mirror line

To revise this entire topic again visit: mationRevision.html mationRevision.html Homepage END OF TOPIC 1 PLEASE RETURN TO THE HOMEPAGE

In Area there formulas that you need to know of by heart, please learnt the following: Area is the measurement of the inside of a shape. Rectangle A= l x w Area of RECTANGLE = length x width Homepage Next

Triangle Parallelogram A= b x h Area of PARALLELOGRAM =base x vertical height Homepage Next

Trapezium Homepage Next

sures/area/quiz/q / Please visit this link in order to make sure you are comfortable working with Areas: END OF TOPIC 2 PLEASE RETURN TO THE HOMEPAGE Homepage

Next Perimeter is the measurement of the outside of a shape. For Example: 6m Perimeter= 6m+6m+6m+6m = 6m X 4 = 24m As a square has 4 equal sides the length of one side would be exactly the same as the other. Therefore you would have to do 6m X 4 which is equivalent to 6m+6m+6m+6m.

s/ Please visit the following website, for your knowledge to develop more! It would be best to try out revise, activity and test.

Radius Diameter A= Π x r 2 Area= Π x (radius) 2 Homepage Next

Circumference is the distance around the circle (perimeter) Circumference= Π x diameter (=2Πr as diameter= 2 x radius) Diameter Circumference Homepage Next