Page 223 - New Medley 5 Semester 1

More Area

Finding the Area of an Irregular Shape

We can find the area of an irregular shape by tracing its outline on a

square or graph paper and counting the number of squares in its interior.

For counting the number of squares, follow these rules:

Z Z Count the number of complete squares in the
interior region. 1.

Z Z Count the number of half-squares. Take the area
1
as square unit for each one.
2
2.
Z Z Count the number of more than half-squares as
complete squares.

Z Z Ignore the area less than half-square.

Consider figure 1.

Number of complete squares = 6

Number of squares more than half-square = 4

and Number of half-squares = 0

\ The area of the figure = 6 + 4 = 10 sq. units

Now, consider figure 2.

Number of complete squares = 9,

Number of half-squares = 3

Number of squares more than half-square = 4

3
\ The area of the figure = 9 + + 4
2

= 13 + 1.5 = 14.5 sq. units

Finding the Area of Paths Inside/Outside a Field

When you come across a plot, a park, a garden, a field, etc., you see,

some paths are made for walking. These paths may be along the length,

221