Page 310 - ICSE Math 8

THREE-DIMENTSIONAL FIGURES

Integrated with Chemistry
In Chemistry, molecules have three-dimensional structures. Hydrocarbons, such as,
methane (CH ) has a tetrahedral structure. It is a pyramid with all faces being equilateral
4
triangles.

H
Can you identify the molecule shown in the following figure? Also,
measure the angle between the chemical bonds.
O

H
Integrated with Computers
3D modeling is one of the essential building blocks of 3D computer graphics used in
engineering, architecture, entertainment, film, special effects, game development, and
commercial advertising.
Prepare a report in MS Word stating applications of 3D modeling in everyday life. Also
list various software required for 3D modeling.

SYMMETRY, REFLECTION AND ROTATION
Integrated with Environmental Science

Go for a nature walk in a garden near your locality and take
pictures of all kinds of interesting symmetrical shapes and patterns.
For example, the leaf has reflection symmetry whereas the flower
shows rotational symmetry.
Make a collage using the pictures collected by you in your scrapbook.
Also, sort the pictures into two different categories: Images that are
examples of rotational symmetry and images that are examples of
reflection symmetry.

CIRCLES
Integrated with Geography
The great-circle distance or orthodromic distance is the shortest distance between two points
on the surface of a sphere, measured along the surface of the sphere.

The great circle is used in the navigation of ship or aircraft. Pretty much useful, P Q v
isn’t it? u

PERIMETER AND AREA OF PLANE FIGURES

Integrated with Architecture
Trapeziums (also called trapezoids) are used to make earthquake
resistant dams and buildings using CSG (Cemented Sand and Gravel).
Make a list of five largest dams in India and compare their storage
capacities.

298