*In the topic "mensuration", the foundation focuses on learning • what is measurement standard? • Absolute and Derived Standards • Measurement by superimposition • Measurement by calculation • Measurement by equivalence (infinitesimal and Cavalieri's principle in 2D and 3D. )*

Finding area of simple figures (squares, rectangle, triangle, polygon) are revised without much discussion.

*click on the content to continue..*

Which of the following is the measure of area?

- distance-span between two points
- surface-span within a closed shape
- surface-span within a closed shape
- space-span within a closed solid

The answer is "surface-span within a closed shape"

What is the area of a square of side `7cm`?

- `28cm`
- `49cm^2`
- `49cm^2`

The answer is "`49cm^2`". *Area of a square is square of the side.*

What is the area of a rectangle of length `7cm` and width `5cm`?

- `24cm`
- `35cm^2`
- `35cm^2`

The answer is "`35cm^2`". *Area of the rectangle is the product of its length and width.*

**Area of a Square and a Rectangle** :

Area of square `=text( side)^2`

Area of rectangle `=text( length ) xx text( width)`

*Solved Exercise Problem: *

What is the area of a rectangle with side `2`cm and `15`mm?

- `2xx15 = 30 cm^2`
- `2xx1.5 = 3 cm^2`
- `2xx1.5 = 3 cm^2`

The answer is "`2xx1.5 = 3 cm^2`". The unit of measurement is made uniform before calculating the area.

*slide-show version coming soon*