Give the pictures of three dimensions as given above to the students. Now, ask the students
to find the number of faces, vertices and edges.
Students should discuss their answers among
two-dimensional shapes using the formulas.
III. Evaluation:
(10 minutes)
1. A classroom is of length 7m, breadth the 6m and height 3m. Find the surface area of the
four walls (Including the area of door and windows).
A three dimensional shapes with 20 faces and 10 vertices. Find the number of edges of the
shape using Euler formula 2.
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Answer:
A cube, rectangular prism, sphere, cone and cylinder are the basic 3-dimensional shapes we see around us
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