Shapes and angles

Shapes and angles: I can name shapes, compare angles, find lines of symmetry and use coordinates.

1. A polygon is a flat shape with straight sides. We name a polygon by counting its sides.

   A triangle has 3 sides. A quadrilateral, like this square, has 4. A pentagon has 5.

   A hexagon has 6 sides, a heptagon has 7 and an octagon has 8.

   This pentagon's sides are not all the same length. It has 5 sides, so it is still a pentagon.

   Picture: 6 shapes. 1: Triangle: an equilateral triangle with its 3 sides marked. 2: Quadrilateral: a square with its 4 sides marked. 3: Pentagon: an irregular pentagon with its 5 sides marked. 4: Hexagon: a regular hexagon with its 6 sides marked. 5: Heptagon: a regular heptagon with its 7 sides marked. 6: Octagon: a regular octagon with its 8 sides marked.

2. Your turn: Here are 3 polygons: A, B and C. Tap the hexagon. Count the sides of each one first.

   Picture: 3 shapes. 1: A: a flat shape with 8 straight sides, all the same length. 2: B: a flat shape with 5 straight sides, all the same length. 3: C: a flat shape with 6 straight sides, all the same length.

   Tap the right part of the picture.

   Answer

   The answer: C

   C is the hexagon: it has 6 sides. A, the octagon, has 8 and B, the pentagon, has 5.

   Picture: 3 shapes. 1: A: a regular octagon with its 8 sides marked. 2: B: a regular pentagon with its 5 sides marked. 3: C: a regular hexagon with its 6 sides marked.

3. These are solid shapes, also called 3D shapes. They are not flat.

   The cube, the cuboid and the square-based pyramid have only flat surfaces.