Regularly shaped figures — 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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Solved examples to find the area

1. Calculate the area of \(5\) squares having the sides of \(2\ m\) each.

Side (\(a\)) \(=\) \(2\ m\)

\begin{array}{l} Area of a square = a \times a \\ = 2 \times 2 \\ = 4 m^{2} \\ Area of 5 squares = 4 m^{2} \times 5 \\ = 20 m^{2} \end{array}

The area of \(5\) squares on each side of \(2\ m\) is \(20\ m^2\).

2. Calculate the area of a rectangle of \(20\ m\) length and \(8\ m\) breadth.

Length \(=\) \(20\ m\)

Breadth \(=\) \(8\ m\)

\begin{array}{l} Area of rectangle = l \times b \\ = 20 \times 8 \\ = 160 m^{2} \end{array}

Therefore, the area of the rectangle is \(160\) \(m^2\).

3. Find the area of a circle whose radius is \(6\ m\). Take

π = \frac{22}{7}

and round off the answer to two decimal places.

Radius (\(r\)) \(=\) \(6\ m\)

\begin{array}{l} Area of circle = π \times r^{2} \\ = \frac{22}{7} \times 6 \times 6 \\ = 113.14 m^{2} \end{array}

The circle having a radius of \(6\ m\) has an area of \(113.14\) \(m^2\).

4. Determine the area of a triangle whose base is \(4\ m\) and height is \(6\ m\).

Base \(b\) \(=\) \(4\ m\)

Height \(h\) \(=\) \(6\ m\)

\begin{array}{l} Area of triangle = \frac{1}{2} \times b \times h \\ = \frac{1}{2} \times 4 \times 6 \\ = 12 m^{2} \end{array}

The area of the triangle is found to be \(12\) \(m^2\).

Did you find an error?

3. Regularly shaped figures