Solid Shapes
Chapter Name : Mensuration |
Sub Topic Code : 104_08_11_05_01 |
Topic Name : Solid Shapes |
|
Sub Topic Name : Solid Shapes |
|
Introduction
The 2D figures are faces of the 3D solids
Pre-Requisites:
Areas of triangles, Rectangle, Square, Trapezium
Activity:
Take all the cylinders around you & observe large cylinders like that of pipelines. Are they all right circular? What shape is your Television set exactly?
Real Life Question:
Are the faces of the ‘Pyramids of Egypt’ congruent?
Key Words / FlashCards
| Key Words | Definitions (pref. in our own words) |
|---|---|
| Cuboid | A box shaped solid that has all of its faces as rectangles |
| Cube | A box shaped solid that has all of its faces as squares |
| Cylinder | A solid object with two identical flat faces which may be circular/elliptical and a curved surface along the depth |
| Cone | A solid/hollow object that has a circular base having curved surface going from narrow at the top to broad at the bottom |
| Pyramid | A solid object having square/triangular base and other sides sloping and meeting at single point at the top (i.e having triangular faces) |
Learning aids / Gadgets
| Gadgets | How it can be used |
|---|---|
| Grocery box packs | Take the grocery packs/tin containers at your home which are to be thrown away. Study them carefully. Identify their shapes |
Real life uses :
Understanding of beauty & imagination led to the creation of different shaped solids. Having said that, they appear in all aspects of life. Most solids around us are in a regular known shape (like cuboid, cube, pyramid etc.) or slightly irregular solid (which can be split into regular solids) and knowing their areas & volumes is a general requirement
Places to visit :
Construction Site, Amusement park, Museums
Practical examples around us
| Examples | Explainations |
|---|---|
| Amusement park | Many of these have pyramid shaped buildings. How is their base? Triangular or square? |
| Dice | It is in a cubical shape |
What you learn in Theory:
The solids around us are having faces or surfaces of the plane figures that we studies
What you learn in Practice:
These faces may be congruent/identical/non-identical.