What will happen to the area of a rectangle if its length is doubled and breadth is tripled?

Mathematics Class 6>Perimeter and Area>Exercise 9>Q 14

1. Perimeter:

Perimeter is the distance covered along the boundary forming a closed figure when you go round the figure once.

(i) Perimeter of a rectangle =2× (length + breadth).

(ii) Perimeter of a square =4× length of its side.

(iii) Perimeter of an equilateral triangle =3× length of any side.

2. Regular Closed Figures:

Figures in which all sides and angles are equal are called regular closed figures.

The perimeter of a regular figure is equal to the number of sides times the size of each side.

3. Area

The amount of surface enclosed by a closed figure is called its area.

4. Area of a Figure Using Graph Paper:

To calculate the area of a figure using a graph paper, the following conventions are adopted:

(i) Ignore portions of the area that are less than half a square.

(ii) If more than half a square is in the region. Count it as one square.

(iii) If exactly half the square is covered, take its area as 12 sq. units.

5. Area of Rectangle and Square:

(i) Area of a rectangle = length × breadth.

(ii) Area of square = side × side.

(iii) The area of a square is more than the area of any other rectangle having the same perimeter.

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