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Question 2 - Page 79 - Solid Shapes - Chapter 4 Class 8 - Exploring Some Geometric Themes (Ganita Prakash II
Last updated at February 26, 2026 by Teachoo
Class 8 (Ganita Prakash - 1, 2 & Old NCERT)
Chapter 4 Class 8 - Exploring Some Geometric Themes (Ganita Prakash II
- Fractals
- Sierpinski Carpet
- Sierpinski Gasket
- Figure it out - Page 72
- Koch Snowflake
- Fractals in Art
- Imagining Solids
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Solid Shapes
- Net of a Cube
- Net of other Figures
- Shortest Paths on a Cube
- Projections
- Top view, Front View, Side view
- Shadows as Projections
- Figure it out - Page 95-97
- Isometric Projections
- Drawing on Isometric Grids
- Figure it out - Page 100, 101
Transcript
Question 2 - Page 79 If the base of a pyramid has 10 sides, how many faces, edges and vertices does the pyramid have? What if the base is an n-sided polygon? Let’s image a 10 sided Pyramid - Imagine a 10 -sided base on the ground, with 10 triangles meeting at a single point in the sky. Faces: You have 1 bottom base + 10 triangular side walls. That's 𝟏𝟏 faces. Formula for an 𝑛-sided base: 𝒏+𝟏 Vertices: There are 10 corners on the base on the ground, plus exactly 1 point at the very top. That's 11 vertices. Formula for an 𝑛-sided base: 𝒏+𝟏 Edges: There are 10 edges around the base on the ground, and 10 edges sloping up to the top point. That's 20 edges. Formula for an 𝑛-sided base: 𝟐𝒏
