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SOLIDS
GRADE 3

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Hello, How are you doing?
Today, we are going to start a new lesson on Solids.

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3-dimensional figure
3-dimensional figure – A figure that has length, width and height.

4. Types of 3-dimensional figures
Rectangular Prism
Cylinder
Cube
Cone
Pyramid
Sphere

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3-dimensioanl figures
Rectangular prism
width
height
length
Vertex
Straight edge
face
Cube

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3-dimensional figures
Cylinder
Curved edge
Curved face
Sphere

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3-dimensional figures
Cone
base
Pyramid

8. Cube and Rectangular Prism
All Cubes are Rectangular Prisms as they all have 6 faces , 12 edges and 8 vertices.
All Rectangular Prisms are not cubes as prisms do not all have 6 faces that are equal sizes.

9. Comparison of 3-dimensional figures
Name
Number of curved sides
Number of flat faces
Number of edges
Number of vertices
Cube 6 12 8
Rectangular Prism
Sphere 1
Cylinder 2
Cone
Pyramid 5

10. 2 and 3 dimensional figures : A difference
2- dimensional figures as squares only have length and width. They do not have height.
3-dimensional figures as cubes have length, width and height.
Square cube

11. What is the shape of the battery shown below?
Answer- cylinder

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Name the following.
The shape of the book –
The shape of the earth-
Answer
Rectangular prism
sphere

13. What is the shape of the given funnel shown below?
Answer- cone

14. The shape of the given ball is ----.
Answer- sphere

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ASSESSMENT

16. 1. Name the 3-dimensional figure the given object looks like.
Answer- cylinder

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2. Which has only one edge?
a) Cone
b) Cylinder
c) Sphere
d) none of these

18. 3. Which two 3-dimensional figures are shown in the figure below?
Answer- cone and sphere

19. 4. Name the 3-dimensional figures shown below.
A B
Answer a) cylinder
b) rectangular prism

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5. Complete the table.
3-dimensional figures
Number of edges 12 2

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6. Which 3–dimensional figure is obtained on folding the figure given below?
Cylinder
Cone
Cube
Rectangular Prism

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7. Mike traced around the bottom of the box shaped like a pyramid. What shape did he get?
Answer- square

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8. Robin uses 2 equal sized circles and 2 equal sized sticks to make a 3- dimensional figure. Name the figure.
Answer- cylinder

24. 9. Choose the right name of the shape shown blow.
Rectangular Prism
Cube
Pyramid
None of the above

25. 10. What is the shape of the container shown below?
Answer-
Rectangular prism

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Recap
3-dimensional figure
Cube
Rectangular prism
Cone
Cylinder
Sphere
Pyramid
Solved examples
Unsolved examples

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Good Work!
Now Practice worksheets on the lesson.