Lesson Notes By Weeks and Term v5 - Grade 1

Lesson Video

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Performance objectives

• This week, we're diving into the exciting world of shapes! We see shapes everywhere around us, from the rectangular doors of our homes to the round wheels of cars and buses. In South Africa, the vibrant patterns on our traditional Ndebele houses are made up of many different shapes. Understanding shapes helps us understand and describe the world around us. It also lays the foundation for more advanced mathematics later on. Knowing your shapes makes building things, drawing, and even packing your lunchbox easier!
• Learning Objectives:
• By the end of this week, learners will be able to:
• Identify and name four basic 2D shapes: circles, squares, triangles, and rectangles. (CAPS: Geometry – 2D Shapes)
• Describe the defining attributes of each 2D shape (e.g., number of sides, corners/vertices). (CAPS: Geometry – 2D Shapes)

Lesson summary

This week, we're diving into the exciting world of shapes! We see shapes everywhere around us, from the rectangular doors of our homes to the round wheels of cars and buses. In South Africa, the vibrant patterns on our traditional Ndebele houses are made up of many different shapes. Understanding shapes helps us understand and describe the world around us. It also lays the foundation for more advanced mathematics later on. Knowing your shapes makes building things, drawing, and even packing your lunchbox easier!

Lesson notes

Let's explore the fundamental 2D shapes: circles, squares, triangles, and rectangles. These shapes are flat – they have length and width, but very little thickness! Think of them like drawings on a piece of paper.

Circle: Definition: A circle is a round shape with no corners or straight sides. It's perfectly curved all the way around.

Examples: Think of the sun, a soccer ball (when viewed from a distance), a round lollipop, or a coin (like a R5 coin). Why is it important? Circles are strong and efficient for things that need to roll, like wheels. They're also pleasing to the eye and often used in designs.

Square: Definition: A square has four straight sides that are all the same length. It also has four corners (called vertices), and each corner is a right angle (like the corner of a book).

Examples: Think of a tile on the floor, a checkerboard square, or a gift box (if all sides are equal). Why is it important? Squares are stable and easy to stack. They're used in building things and making grids.

Triangle: Definition: A triangle has three straight sides and three corners (vertices). The sides can be of any length.

Examples: Think of a slice of pizza, a yield sign on the road, the roof of a house (sometimes), or a triangular sandwich. Why is it important? Triangles are very strong shapes. They are used in bridges and buildings to provide support.

Rectangle: Definition: A rectangle has four straight sides and four corners (vertices), each of which is a right angle. Opposite sides are equal in length. That means two sides are longer and two sides are shorter (but a square is also a special kind of rectangle where all sides are equal!).

Examples: Think of a door, a book, a table, or a flag of South Africa (it's rectangular!). Why is it important? Rectangles are useful for making rooms, books, and other things that need to be longer than they are wide.

Connecting 2D Shapes to 3D Objects: Now, let's see how these 2D shapes show up on 3D objects – things that have length, width, and height (or depth). A ball is a 3D object, but if you look at it head-on, it looks like a circle. A cube (like a dice) is a 3D object made up of squares on each of its faces. A prism (like a Toblerone chocolate box) can have triangles on its ends. A rectangular prism (like a shoebox) is made up of rectangles on each of its faces.

Worked example

Example 1: I have a shape with 4 equal sides and 4 corners. What shape am I?

Answer: You are a square.

Explanation: The definition of a square is having 4 equal sides and 4 corners (right angles).

Example 2: Thando is eating a slice of watermelon. The slice has 3 sides. What shape is the watermelon slice?

Answer: The watermelon slice is shaped like a triangle.

Explanation: A triangle is defined by having three sides.

Example 3: Neo is drawing a picture of a house. The door of the house has 4 sides, but 2 sides are long and 2 sides are short. What shape is the door?

Answer: The door is shaped like a rectangle.

Explanation: A rectangle has 4 sides, where opposite sides are equal.

Guided Practice (With Solutions)

Question 1: Draw a circle, a square, a triangle, and a rectangle. Label each shape with its name.

Solution: Learners should draw the shapes accurately and label them clearly. This reinforces visual recognition and naming.

Question 2: A window has 4 sides. All the sides are the same length. What shape is the window?