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

Number of complete squares = 11
Number of more than half squares = 8
Number of half squares = 2
Total number of squares = 11 + 8 + 2 = 21
Area of the square = 1 cm x 1 cm = 1 cm²
Area of 21 squares = 21 x 1 = 21 cm²

So, approximate area of lamina = 21 cm².