Three-dimensional shapes
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CLASS: Basic 3
SUBJECT: Mathematics
TOPIC:Â Three-dimensional shapes
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CONTENT:
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Three-dimensional shapes are shapes which can be measured in 3 directions. These shapes are also called solid shapes. They have Length,
width, and height which are the three measurements of the three-dimensional shapes.
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Examples of three-dimensional shapes are:
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Cube
Cuboid
Cylinder
Cone
Sphere
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Three-dimensional shapes have many
attributes such as:
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Vertices
Faces, and
Edges.
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Vertices: These are points where 3 edges meet.
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Faces: These are the flat surfaces of the three-dimensional shapes.
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Edges: These are the line segment where two faces meet. Don’t worry the diagram below will explain it better.
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Examples and properties of three-dimensional shapes.
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- Cube, E.g dice, st. Luis cube sugar etc.
- It has 6 faces.
- It has 12 edges.
*It has 8 vertices.
Each face of a cube is square in shape.
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- Cuboid, E.g rectangular box, rectangular cupboard etc.
- It has 6 faces
- It has 12 edges.
- It has 8 vertices.
Each face of a cuboid is rectangle in shape.
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- Cylinder, E.g Gas cylinder, milo tin, milk tin etc.
- It has 2 circular faces.
- It has 1 curved surface.
- It has 2 circular edges.
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- Cone, E.g Ice cream, Christmas cap etc.
- It has 1 circular base.
- It has 1 curved surface.
- It has 1 circular edge.
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- Sphere, E.g balls
- It has no vertex.
- It has no edge.
- It has 1 curved surface.
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EVALUATION:
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- List three objects in your environment that have the shape of cylinder.
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- List two objects in your environment that have the shape of sphere.
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- A cube has ________ vertices.
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- How many edges has a sphere?
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- Draw a cone.
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- State the three attributes of three-dimensional shapes.