Lesson Notes By Weeks and Term v5 - Grade 5

Lesson Video

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Performance objectives

• Identify and describe properties of 2D shapes (sides, angles, symmetry).
• Identify and describe properties of 3D objects (faces, edges, vertices).
• Tell the difference between 2D shapes and 3D objects.
• Draw 2D shapes accurately.

Lesson summary

Geometry is all around us! From the rectangular shape of your classroom door to the spherical shape of a soccer ball, understanding shapes and their properties helps us make sense of the world. In South Africa, we see these shapes in our traditional huts, in the patterns on our fabrics, and in the design of our buildings. This week, we will focus on further exploring the properties of 2D shapes (like squares and triangles) and 3D objects (like cubes and spheres). We'll delve deeper into understanding their characteristics, which will help you in many areas, from building things with blocks to understanding maps and plans.

Lesson notes

2D Shapes: Properties 2D shapes are flat shapes that have only two dimensions: length and width.

Let's review some important properties: Sides: The lines that make up the shape.

Angles: The space formed where two sides meet. Angles are measured in degrees. A right angle is 90 degrees.

Vertices (singular: vertex): The corners of the shape where sides meet.

Lines of Symmetry: A line that divides a shape into two identical halves that are mirror images of each other.

Examples: Square: Properties: 4 equal sides, 4 right angles, 4 vertices, 4 lines of symmetry.

Rectangle: Properties: 2 pairs of equal sides, 4 right angles, 4 vertices, 2 lines of symmetry.

Triangle: Properties: 3 sides, 3 angles, 3 vertices.

Types: Equilateral: All 3 sides are equal, all 3 angles are 60 degrees.

Isosceles: 2 sides are equal, 2 angles are equal.

Scalene: All 3 sides are different lengths, all 3 angles are different.

Right-angled: Contains one right angle (90 degrees).

Circle: Properties: No sides, no vertices. It is a closed curve. It has infinite lines of symmetry.