Area — lesson. Science State Board, Class 7.

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எங்கள் ஆசிரியர்களுடன் 1-ஆன்-1 ஆலோசனை நேரத்தைப் பெறுங்கள். டாப்பர் ஆவதற்கு நாங்கள் பயிற்சி அளிப்போம்

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Length is one of the fundamental quantity that cannot be conveyed in any other way. Other measurements, in derived quantities such as area and volume, can be calculated using length.

Area is the amount of space on a flat or a plane surface or a two-dimensional object. In general, length is a fundamental quantity. Here, length is multiplied twice to calculate the area, which is a derived quantity.

The formula is given as,

\begin{array}{l} Area = Length \times Breadth \\ = l \times b \end{array}

Using the above formula, one can find the area of a book or a house or even a plot of land.

Unit of area $=$ ${metre} \times{metre}$ $=$ $metre^2$ (or) $m^2$

The SI unit of the area of a surface is $square\ metre$ ($m^2$) since it is a product of two lengths.

One square metre denotes the area enclosed inside a square of side $1\ metre$.

Even though the area is measured in a $square\ metre$, the surface does not have to be square.

Area of regular figures

Some of the formulae used to find the area of regularly shaped figures is shown below.

Shape	Two-dimensional figure	Area
Square		$\begin{array}{l} side \times side \\ a \times a = a^{2} \end{array}$
Rectangle		$\begin{array}{l} length \times breadth \\ l \times b \end{array}$
Circle		$\begin{array}{l} π \times {radius}^{2} \\ π r^{2} \end{array}$
Triangle		$\begin{array}{l} \frac{1}{2} \times base \times height \\ \frac{1}{2} \times b \times h \end{array}$

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2. Area

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