Page 172 - Touchpad Mathematics_Ver1.0_C4

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Picture drawn by Nupur Picture drawn by Nikhil
6 cm 12 cm

8 cm 8 cm
10 cm 10 cm

12 cm

6 cm
1. Length of ribbon required for the picture drawn by Nupur

= _____ cm + _____ cm + _____ cm + _____ cm = _____ cm

2. Length of ribbon required for the picture drawn by Nikhil
= _____ cm + _____ cm + _____ cm + _____ cm = _____ cm

3. They need to buy _____ cm ribbon in all to decorate the pictures.

Perimeter

Ankit goes for a walk every
morning. He wants to go around
a region in the park, so he starts
walking from a tree. When he

returns to the same tree, he
would have walked along the
entire path around the region.
The length of the whole path,

shown by the dotted line, is the
perimeter of the region around
which Ankit walks.

Perimeter of a Polygon

We know that the distance around the boundary of a figure is its perimeter.
The perimeter of a closed figure bounded by line segments (called a polygon) can be
found using square grid paper. If the sides of a polygon lie on the grids of the squared

paper, the lengths of the sides of the polygon can be found simply by counting the
number of squares. Each square on the grid is 1 unit length.

170 Mathematics 4