Three-dimensional objects are described by the types and arrangements of surfaces that bound them: flat surfaces, or faces, and curved surfaces. Familiar solids such as cubes, cuboids, cylinders, cones, and spheres can be compared by these features, including recognizing that some have only flat or curved surfaces while others have both; formal measurement, nets, and advanced classification by edges and vertices are not included.
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Detailed Explanation: Describe 3D objects by flat and curved surfaces
A 3D object is a solid shape. Look at the surfaces that make up its outside:
- A flat surface is smooth and level, like the side of a box.
- A curved surface bends, like the outside of a ball.
Example: Describe a cylinder
Imagine a soup can.
- Look at the top. It is a flat circular surface.
- Look at the bottom. It is another flat circular surface.
- Look around the side. It bends all the way around, so it is curved.
So, a cylinder has:
- flat surfaces
- curved surface
We can describe it by saying:
A cylinder has two flat surfaces and one curved surface.
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3D Shape Surfaces - Has Count of Flat/Curved Surfaces to Shape
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Download/Modify Free Grade 1 'Describe 3D objects by flat and curved surfaces' Worksheet
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This Worksheet Includes:
- 3D Shape Surfaces - Has Count of Flat/Curved Surfaces to Shape
- 3D Shape Surfaces - Shape to Count of Flat/Curved Surfaces
- Simple 3D Shapes
- 3D Shape Surfaces - Has Flat/Curved Surface to Shape
- 3D Shape Surfaces - Shape to Has Flat/Curved Surface
- Simple 3D Shapes - Reversed
- Simple 3D Shapes (Real World)
- Simple 3D Shapes (Real World) - Reversed
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