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Shapes around us. How many can you spot?

Shapes around us. How many can you spot?. 2D Shapes Vocabulary. Let’s see how many words we use to describe or are connected with 2D shapes. 2D shapes - words. In pairs, talk about the words and decide on a definition to share with the group.

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Shapes around us. How many can you spot?

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  1. Shapes around us. How many can you spot?

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

  3. 2D shapes - words In pairs, talk about the words and decide on a definition to share with the group

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

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

  6. 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.)

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

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

  9. 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?.

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

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

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

  13. 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 Radiusisany line that is drawn between the centre of the circle to the circumference

  14. 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 < <

  15. 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 << << < < < << << <

  16. 2D ( 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 2D.

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

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

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

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

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

  22. 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?

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

  24. Recap Answers 1. A polygon is a many sided shape • A regular polygon is a shape with equal sides and equal angles • 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

  25. 2D shapes – words – student record 1

  26. 2D shapes – words – student record 2

  27. What shapes can you see in this picture?

  28. What shapes can you see in this picture?

  29. What shapes can you see in this picture?

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