Calculate total area of the margin — task. Mathematics CBSE, Class 7.

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A picture of length 21

$cm$ and breadth 15

$cm$ is painted on a chart, such that there is a margin of 1

$cm$ along each of its sides. Find the total area of the margin.

[Note: The total area of the margin = Area of the chart - Area of the picture]

The total area of the margin is

${cm}^{2}$ .

$1$

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6. Calculate total area of the margin