Lesson Notes By Weeks and Term v5 - Grade 2

Lesson Video

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Performance objectives

• Identify and name pentagons and hexagons.
• Identify and name cylinders, cones, and spheres.
• Describe the properties of these shapes and objects.
• Tell the difference between 2D shapes and 3D objects.

Lesson summary

In Grade 2, understanding shapes and objects around us is super important! In South Africa, from the rondavels we might see in rural areas (cylinders and cones) to the rectangular shapes of our classrooms and the spherical shape of a soccer ball, geometry is everywhere. This week, we'll be exploring more 2D shapes (like pentagons and hexagons) and 3D objects (like cylinders, cones, and spheres). Knowing about these shapes helps us describe and understand the world better, build things, and even solve problems. Imagine building a shack – you'd need to know about rectangles for the walls!

Lesson notes

2D Shapes: Pentagons and Hexagons What are 2D Shapes? 2D shapes are flat shapes that only have two dimensions: length and width. Think of a drawing on a piece of paper.

Pentagon: A pentagon is a 2D shape with five straight sides and five corners (vertices). Think of the home plate in a baseball field! The sides of a pentagon don't all have to be the same length.

Example: Imagine a sign that says "Stop". Many stop signs are shaped like pentagons.

Hexagon: A hexagon is a 2D shape with six straight sides and six corners (vertices). Think of a honeycomb that bees make – the little compartments are often hexagons! The sides of a hexagon don't all have to be the same length.

Example: Think of a nut used with a bolt to build things. These nuts are often hexagon-shaped so that a wrench can grip them easily. 3D Objects: Cylinders, Cones, and Spheres What are 3D Objects? 3D objects are solid shapes that have three dimensions: length, width, and height. Think of something you can hold in your hand.

Cylinder: A cylinder has two circular flat faces (ends) and one curved surface connecting them. Think of a can of beans or a roll of toilet paper! It has no edges or vertices.

Example: Think of a cool drink can. It's a cylinder.

Cone: A cone has one circular flat face (the base) and one curved surface that comes to a point (the apex or vertex). Think of an ice cream cone or the roof of a traditional rondavel house!

Example: Think of a traffic cone used to warn people near road works.

Sphere: A sphere is a perfectly round 3D object. All points on its surface are the same distance from the center. Think of a soccer ball or a marble! It has no flat faces, edges, or vertices, and has only one curved surface.

Example: Think of a globe showing a map of the world. It’s a sphere. Difference Between 2D and 3D The key difference is that 2D shapes are flat and 3D objects are solid. You can draw a 2D shape on paper, but you can hold a 3D object in your hand.

Examples: 2D: A square window (the frame), a triangular road sign, a rectangular book cover, a pentagon-shaped piece of cardboard, a hexagon-shaped tile. 3D: A soccer ball, a box of cereal, a toilet paper roll, an ice cream cone, a water bottle. Guided Practice (With Solutions)

Question 1: Draw a pentagon. How many sides does it have?

Solution: Learners should draw a shape with 5 sides and 5 corners. The number of sides is

5. Commentary: This question reinforces the definition of a pentagon.

Question 2: Name three things you see in the classroom that are approximately cylindrical.

Solution: Possible answers include: a glue stick, a marker, some drinking straws (in a container).

Commentary: This encourages learners to apply their knowledge to real-world objects.

Question 3: Is a soccer ball a 2D shape or a 3D object? Why?

Solution: A soccer ball is a 3D object because it has length, width, and height (it's solid). You can hold it in your hand.

Commentary: This reinforces the distinction between 2D and 3

D. Question 4: I have one circular face and one curved surface that comes to a point. What am I?

Solution: A cone.

Commentary: This reinforces the properties of a cone.

Question 5: Draw a hexagon. Colour it blue.

Solution: Learners should draw a shape with 6 sides and 6 corners and colour it blue.

Commentary: This reinforces the definition of a hexagon through a visual task. Independent Practice (Questions Only) Draw a picture using at least one pentagon, one hexagon, one cylinder, one cone, and one sphere. Label each shape/object.

Sort these shapes/objects into two groups: 2D shapes and 3D objects: triangle, cube, circle, sphere, hexagon, cylinder, square, cone, pentagon. What shape is a pizza box? What shape is a dice? Name two things in your house that are shaped like a sphere.

True or False: A cylinder has only one flat face. How many corners (vertices) does a pentagon have? If you cut a cylinder in half, what shape would the cut face be? (Hint: think about cutting a carrot). Draw two different pentagons. The sides do not all have to be the same length. Draw two different hexagons. The sides do not all have to be the same length.