Summer Block 2 Properties of Shape Lesson 8

Summer Block 2: Properties of Shape Lesson 8: To be able to identify regular and irregular polygons Summer Block 2 – Properties of Shape 8

To be able to identify regular and irregular polygons Success criteria: ü I can use sketching and measuring, as well as my properties of shapes knowledge, to help me identify regular and irregular polygons ü I can explain my reasoning when using sketching and measuring, as well as my properties of shapes knowledge, when identifying regular and irregular polygons Summer Block 2 - Properties of Shape - Lesson 8 - To be able to identify regular and irregular polygons

To be able to identify regular and irregular polygons Starter: Look at the sides and angles in each of these polygons. Which one doesn’t belong? Explain your answer.

To be able to identify regular and irregular polygons Starter: In three of the four shapes all the sides and angles are equal. This makes them regular polygons. 108 o 45 o 60 o 108 o 60 o The right-angled triangle doesn’t belong. The square, pentagon and equilateral triangle are all regular polygons, as each polygon’s sides and angles are equal. 60 o

To be able to identify regular and irregular polygons Activity 1: Using your squared paper, draw large versions of the following: • a square • right-angled triangles • scalene triangles (all sides different) • Irregular quadrilaterals (4 sides) • irregular pentagons (5 sides) • irregular hexagons (6 sides)

To be able to identify regular and irregular polygons Talking Time: In a regular polygon all sides are equal in length. In an irregular polygon at least one side is different in length to the rest. Which is the irregular polygon here? Why?

To be able to identify regular and irregular polygons Talking Time: Which is the irregular polygon here? Why? Both white shapes are squares and have 4 equal sides. The shaded shape is a rectangle so 2 sides are longer in length than the other 2.

To be able to identify regular and irregular polygons Talking Time: Identify the irregular polygon.

To be able to identify regular and irregular polygons Talking Time: Identify the irregular polygon.

To be able to identify regular and irregular polygons Talking Time: Identify the irregular polygon.

To be able to identify regular and irregular polygons Talking Time: Identify the irregular polygon.

To be able to identify regular and irregular polygons Talking Time: Identify the regular polygon.

To be able to identify regular and irregular polygons Talking Time: Identify the regular polygon.

To be able to identify regular and irregular polygons Talking Time: Identify the regular polygon.

To be able to identify regular and irregular polygons Talking Time: Identify the regular polygon.

To be able to identify regular and irregular polygons Activity 2: Extension: What do you notice about the polygons? Draw a mixture of regular and irregular shapes on square grid paper.

To be able to identify regular and irregular polygons True or False: Are the following statements sometimes, always or never true? a) A square is a regular polygon. b) A triangle is an irregular polygon. c) Irregular polygons have more angles than sides. Explain your answers.

To be able to identify regular and irregular polygons True or False: Are the following statements sometimes, always or never true? a) A square is a regular polygon. Always true – all squares have equal side lengths and equal angles. b) A triangle is an irregular polygon. Sometimes true – most triangles are irregular, but equilaterals are regular. c) Irregular polygons have more angles than sides. Never true – all polygons, both regular and irregular have the same amount of angles as they have sides.

To be able to identify regular and irregular polygons Challenge: Complete the Frayer model below. definition: A polygon that does not have all sides equal and all angles equal. example: characteristics: It can have sides of any length and each interior angle can be any degree measurement. At least one side length and one angle must be different for it to be irregular polygon non-example:

To be able to identify regular and irregular polygons Challenge: Complete the Frayer model below. definition: A polygon that does not have all sides equal and all angles equal. example: characteristics: It can have sides of any length and each interior angle can be any degree measurement. At least one side length and one angle must be different for it to be irregular polygon non-example:

To be able to identify regular and irregular polygons Evaluation: If I combine a regular hexagon and an equilateral triangle, the composite shape I make is regular. Do you agree? Explain you answer.

To be able to identify regular and irregular polygons Evaluation: If I combine a regular hexagon and an equilateral triangle, the composite shape I make is regular. No, I do not agree. By creating a composite shape made from a regular hexagon and an equilateral triangle, the shape now has differing angles and side lengths.

To be able to identify regular and irregular polygons Success criteria: ü I can use sketching and measuring, as well as my properties of shapes knowledge, to help me identify regular and irregular polygons ü I can explain my reasoning when using sketching and measuring, as well as my properties of shapes knowledge, when identifying regular and irregular polygons Summer Block 2 - Properties of Shape - Lesson 8 - To be able to identify regular and irregular polygons