📏 Important Properties
A Rectangular Prism Has:
• Length, Width, and Height
• 6 faces (all rectangles)
• 12 edges
• 8 corners
Special Note: If all edges are the same length, it becomes a **Cube**!
✏️ Let’s Practice Together, My Dear Student!
Practice 1: Faces, Edges, Vertices
1. How many faces? 6
2. How many edges? 12
3. How many corners? 8
Practice 2: Is it a Cube or Rectangular Prism?
1. All edges same length → Cube
2. Length 10 cm, width 6 cm, height 4 cm → Rectangular Prism
Practice 3: Word Problems (Canadian Style)
1. A cereal box is 25 cm tall, 18 cm long, and 8 cm wide. How many faces does it have?
6 faces
2. Your classroom is shaped like a rectangular prism. If you walk around all four walls on the floor, you are walking the perimeter of the base. But to find the total surface area, we need length, width and height. (We will learn surface area later!)
Challenge Question
How is a rectangular prism different from a cube?
In a rectangular prism, the length, width, and height can be different. In a cube, all are the same.
Fantastic Job, My Dear Student! 🎉
You now understand rectangular prisms (also called cuboids) very well! They are one of the most common 3D shapes in our world.
I am so proud of you for learning 3D shapes. Look around your room — how many rectangular prisms can you find?
💕 You are smart. You are kind. You can do hard things.
When you are ready, tell me the next topic (Pyramids, Cones, Cylinders, Spheres, or anything else) and I will create another beautiful lesson just for you!