Maths Visualizing Solid Shapes part 5 (Sphere, Cone) CBSE Class 7 Mathematics VII  Summary and Q&A
TL;DR
Learn how to visualize a sphere as a stacked arrangement of circles and a cone as a rotation of rightangled triangles.
Key Insights
 ⭕ Visualizing a sphere involves stacking circles in a circular fashion.
 🙈 A sphere can also be seen as made up of circles gradually increasing and decreasing in diameter.
 🔺 A cone can be created by tilting and stacking rightangled triangles or by rotating a rightangled triangle in a circular fashion.
 💠 Both spheres and cones are threedimensional objects composed of twodimensional shapes.
 💠 Understanding the relationship between twodimensional and threedimensional shapes helps in visualizing solid shapes.
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Transcript
hello friends this video on visualizing solid shapes part 5 is brought to you by exam fear.com no more fear from exam a sphere again when you think of a sphere that's a ball maybe so when you think of that ball what is that twodimensional figure that comes to your mind that which can make that sphere yes circle so what you need to do in this case ... Read More
Questions & Answers
Q: How can a sphere be visualized using circles?
To visualize a sphere, imagine stacking circles in a circular fashion, with each circle slightly tilted and the central line passing through its center. This arrangement creates the illusion of a sphere.
Q: What is the relationship between a sphere and a circle?
A sphere is a threedimensional object made up of circles. When circles are stacked in a circular fashion, the resulting arrangement appears as a sphere.
Q: How can a cone be visualized using rightangled triangles?
A cone can be visualized by tilting and stacking rightangled triangles, with their perpendiculars pasted together. As more triangles are added, the object transitions from a twodimensional shape to a threedimensional cone.
Q: What is the connection between a rightangled triangle and a cone?
By rotating a rightangled triangle about one of its short sides, it can be visualized as a cone. This demonstrates that a cone is a threedimensional object composed of twodimensional rightangled triangles.
Summary & Key Takeaways

A sphere can be visualized by stacking circles in a circular fashion, with each circle slightly tilted and the central line passing through its center.

Similarly, a cone can be visualized by tilting and stacking rightangled triangles, with their perpendiculars pasted together.

Both the sphere and cone can be understood as threedimensional objects composed of twodimensional shapes.