📘 Three-Dimensional Shapes - Page 2 Explanation
📖 Open your textbook page number 2.
This page explains Three Dimensional Shape (3D), discussion activity, and elements of shapes.
🧊 Three Dimensional Shape (3D)
📏 Height ↔️ Length ↕️ Width
A three-dimensional shape has length, width, and height. Such shapes are solid shapes.
This means 3D shapes are not flat. They take up space.
💬 Mathematical Discussion
In this activity, we compare real solid objects with their flat parts or shadows.
🌳 1) A tree and its shadow
A tree is a solid object, so it is three-dimensional. Its shadow falls on a flat surface, so the shadow looks two-dimensional.
🚪 2) Faces of cupboard and cupboard
A cupboard is a solid object, so it is three-dimensional. The faces of the cupboard are flat surfaces, so they are two-dimensional.
🧳 3) Faces of trunk and trunk
A trunk is a solid object, so it is three-dimensional. The faces of the trunk are flat surfaces, so they are two-dimensional.
🧪 Do it
In the Do it activity, the order is like this:
❓ “How can you create three-dimensional shapes?”
💬 “I will fill a matchbox with wet soil and make brick out of it.”
✅ “Correct. Is the resulting shape (Cuboid) brick shape, three-dimensional? Check this.”
This activity shows that a brick-like shape can be made using a matchbox and wet soil. The shape formed is like a cuboid. A cuboid has length, width, and height. So, it is a three-dimensional shape.
📐 Elements of Shapes
📄 Two Dimensional Shape
▭ Rectangle
🔹 Vertex
🔹 Side (arm)
A rectangle is a two-dimensional shape. It has sides and vertices.
Example: In a rectangle, the top line, bottom line, left line, and right line are sides.
🔹 Vertex: A vertex is a corner point where two sides meet.
Example: In a rectangle, each corner is a vertex.
🧊 Three Dimensional Shape
📦 Cuboid
🔸 Vertex
🔸 Edge
🔸 Face
A cuboid is a three-dimensional shape. It has faces, edges, and vertices.
Example: In a cuboid, the front flat part is one face. A box has 6 faces.
🔸 Edge: An edge is the line where two faces meet.
Example: In a cuboid, the line where the top face and front face meet is an edge.
🔸 Vertex: A vertex is a corner point where edges meet.
Example: In a cuboid, each corner is a vertex. A box has 8 vertices.
📄 In a 2D shape, we mainly see sides and vertices.
🧊 In a 3D shape, we see faces, edges, and vertices.
👩🏫 Teacher Instructions
This means students should touch and observe real objects like a box, brick, ball, or bottle. This helps them understand three-dimensional shapes clearly.
🌟 Conclusion
On page number 2, we learned that three-dimensional shapes occupy place in space. We also learned about tree and shadow, faces of cupboard and cupboard, and faces of trunk and trunk. Finally, we learned the elements of shapes: side (arm), vertex, edge, and face.
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