2 D Shapes Vocabulary Lets see how many

2 D Shapes Vocabulary Let’s see how many words we use to describe or are connected with 2 D shapes

2 D shapes - words In pairs, talk about the words and decide on a definition to share with the group

Tessellation – is covering an area with shapes leaving no spaces You can use the same shape.

Tessellation – is covering an area with shapes leaving no spaces You can use the same shape. Return

Symmetry is when both sides of the shape or pattern are the same when viewed from the central line. Some shapes have a line (or lines) of symmetry - sometimes called 'mirror lines'. In each case, if you stood a mirror on the line of symmetry, the shape would look unchanged. (You can check this by using a mirror, or by tracing a shape and folding it along the mirror line. )

Patterns can also be symmetrical <<< <<< **** +++ ********** +++ **** Draw the line(s) of symmetry on the shapes above

What is a polygon? A shape with many sides and angles.

Regular polygons are a never-ending series of shapes with one special feature All the sides and angles are the same size. Do you know any regular polygons? .

Here are some a regular polygons? Equilateral Triangle Square 3 sides 4 sides 3 equal angles 4 equal angles Hexagon Octagon 6 sides 8 sides 6 equal angles 8 equal angles Click anywhere on the page until you fill all the boxes

What are the properties of these regular polygons? Pentagon A pentagon has 5 equal sides and 5 equal angles Heptagon A heptagon has 7 equal sides and 7 equal angles Decagon A decagon has 10 equal sides and 10 equal angles Nonagon A nonagon has 9 equal sides and 9 equal angles Write your answers and check them by clicking 4 times

• A circle is a flat round shape. • The distance from the centre to the outside of the circle is always equal.

Circle Vocabulary A circle has one side around the outside called the circumference Diameter is any line across the circle that passes through the centre of the circle Radius is any line that is drawn between the centre of the circle to the circumference

Parallel Lines Two lines are parallel if they are always the same distance apart. This means they will never meet even if they are extended < < < The arrowhead indicate that these two lines are parallel

Parallel Lines Some shapes have 1 or 2 pairs of parallel lines < < << << < < The arrowhead indicate that these two lines are Sometimes << arrowheads are used to show a second pair of parallel lines

2 D ( 2 dimensional) Here is a line. This has one dimension (length) All flat shapes have two dimensions, length and width (breadth). So they are called 2 D.

What is an angle? When two lines join two angles are formed. X X When two lines intersect 4 angles are formed X X

Angles are measured with a protractor 1200 600 Two angles are formed. One angle is 1200 and the other is 600. Together they make 1800.

Angles are measured with a protractor A right-angle is 90 o

Angles are measured with a protractor Two right-angles are 180 o Four right-angles are 360 o

A circle has 360 o around its centre point Two right-angles are 180 o Four right-angles are 360 o

What is a complex shape? A complex shape is a shape that can be broken into smaller shapes. What shapes can you see in these complex shapes?

Recap 1. What is a polygon? 2. What is a regular polygon? 3. Name 6 regular polygons. List their properties Next

Recap Answers 1. A polygon is a many sided shape 2. A regular polygon is a shape with equal sides and equal angles 3 • § § § § Any of the following: Equilateral Triangle – 3 equal sides & angles Square – 4 equal sides 4 right-angles Pentagon – 5 equal sides & angles Hexagon – 6 equal sides & angles Heptagon – 7 equal sides & angles Octagon – 8 equal sides & angles Nonagon – 9 equal sides & angles Decagon – 10 equal sides & angles

2 D shapes – words – student record 1

2 D shapes – words – student record 2

What shapes can you see in this picture?