Question

Find the approximate area of an irregular lamina of which boundary line is drawn on the graph paper shown in fig. below.

Answer 1

Here, The area of lamina is equal to the sum of the area of complete squares and the area of squares more than half.
From the given figure,
$\text{The number of complete squares}=11$
$\text{The number of squares more than half}=9$
So, $\text{total number of squares}=11+9=20$
Area of lamina
Dimension of each square is $1cm\times 1cm$
So, area of the 1 square $=1cm\times 1cm=1c{m}^2$
Therefore, area of 20 squares $=20\times 1c{m}^2=20c{m}^2$
Hence, approximate area of irregular lamina is $20c{m}^2$ .