Lesson Notes By Weeks and Term v4 - JHS 3

Lesson Video

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Performance objectives

• Describe the characteristics of prisms and pyramids.
• Differentiate between prisms and pyramids.
• Explain the importance of these shapes in the real world.
• Create and communicate simple designs using these shapes.

Lesson summary

This lesson introduces learners to the fundamental 3D shapes used in design and production: prisms and pyramids. We see these shapes everywhere in Ghana – from the box of Ideal Milk in the kitchen and the shape of a pyramid on a building's roof, to the packaging for a new phone. To create these 3D objects from flat materials like cardboard, metal sheets, or fabric, we must first be able to "unfold" them into a 2D plan. This plan is called a surface development or a net. Understanding this process is the first step in communicating a design idea so that it can be accurately made by a craftsman, a machine, or even by yourself.

Lesson notes

This topic forms the bridge between a 2D drawing and a 3D product. Let's break down the key ideas. A. What are Solid (3D) Shapes?

Solid shapes are objects that have three dimensions: length, width, and height. They occupy space. Before we can talk about specific shapes, we need to know their parts: Face: A flat surface of a solid shape. (e.g., the front of a sugar box). Edge: A line where two faces meet. (e.g., the corner line of the sugar box). Vertex (plural: Vertices): A point or corner where three or more edges meet.

Example: A Box of Matches (Cuboid) It has 6 faces (top, bottom, front, back, left, right). It has 12 edges (count them!). It has 8 vertices (corners). B. Prisms

A prism is a solid shape with two identical, parallel bases (end faces) and flat rectangular sides. Think of it like a loaf of bread – every slice you cut has the same shape as the end of the loaf. Prisms are named after the shape of their base.

Evaluation guide

• B9.5.1.1
• Demonstrate
• understanding of
• developing surfaces of objects for production/