Properties Of 2D & 3D Shapes

Objectives

To know the difference between 2D & 3D shapes and to be able to describe the properties of different shapes, demonstrating an improved mathematical vocabulary.

Resources

Abacus 4 Textbook 3 | Scanner or copier | Types of Triangles (YouTube) | Types of Quadrilaterals (YouTube)

Today's Lesson

Main Activity

At the start of this and the next lesson, call out a few random decimal numbers for your student to add or subtract mentally.

For example:

5.6 + 1.5 =

9.2 – 1.6 =

Turn to page 35 in Abacus 4 Textbook 3.

Either copy the page, or allow your student to write directly in the textbook.

Look at the different triangles on the page with your student. Ask them to explain to you the properties of an equilateral and isosceles triangle, as these have been worked with before. Watch Types of Triangles (YouTube) as a reminder if required.

Read the information about scalene triangles and then ask your student to identify all the different triangles in the diagram.

Once they have shown a good understanding of this concept, ask your student to draw lines from each name to join with the appropriate triangle.

Next, look at the second diagram and ask your student to read the description of a rhombus. Watch Types of Quadrilaterals (YouTube) to recap quadrilaterals if required.

Talk about parallel lines with your student and ask them to think of various examples of parallel lines in the world around them, for example, railway tracks, roads, buildings, doors, and so on. Then ask your student to identify the different rhombuses in the diagram.

Turn to page 36.

Either copy the page, or allow your student to write directly in the textbook.

Watch '3D Shapes'.

Ask your student to write all the different properties of the shapes, for example, faces, sides, edges and vertices, as in the example below:


3D	2D
Cube - 6 faces	Square – 4 sides
12 edges	4 vertices
8 vertices

Citations

[1] www.youtube.com [2] www.youtube.com [3] www.youtube.com [4] www.youtube.com