Fields And Fences Chapter Notes | Mathematics for Class 4: NCERT PDF Download

Introduction

Today, we're venturing into the world of fields and fences, where we'll learn about the importance of boundaries and how they shape our surroundings. Just like how lines in a drawing define its shape, fences outline and protect fields, creating spaces for various activities and purposes. In this lesson, we'll explore different types of fences, their materials, and the role they play in farming, gardening, and even in our neighborhoods. So, get ready to discover the significance of boundaries and how they help us define and organize the spaces we live in!" 

Field and Fences

• An open area of land where farmers do agriculture work is called a field.

• A method that is used to protect the crops from domestic or wild animals that can spoil crops or people who can pluck the crops is fencing.

• Fencing can be done with wire or wood or stone. 

• Fences are not only used to protect crops but also we can add fences around our homes, properties etc for safety.

Boundary

• The line around the outer edge of a shape is considered a boundary. 

• The shape would be a perfect geometric shape or any irregular shape.

• The farms will not be regular always, the area will be unequal, boundaries will be uneven, etc.

Measure of Boundary

• The finding of the length or size of something is measurement. 

• Suppose if a farm is in a rectangle shape then take the length of all sides then by adding all these sides we get the boundary value.

• The Mathematical term ‘Perimeter’ can be used instead of a boundary.

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School Garden

By Finding the boundary of each garden we can compare which is bigger, 

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Determing How many Square would be required 

To determine how many 1 cm squares will fill a figure, you need to count the total number of 1 cm squares that fit within the boundaries of the figure.

1. Begin by visually identifying the boundaries of the figure.
2. Next, systematically place 1 cm squares inside the figure, ensuring that each square fits completely within the boundaries and does not overlap with other squares.
3. Count the total number of 1 cm squares used to fill the entire figure.

For irregular shapes or shapes with curved boundaries, you may need to estimate the number of squares by dividing the shape into smaller, more manageable sections and counting the squares within each section.

This process allows you to calculate the area of the figure using square units (such as square centimeters) and provides an approximation of the total area covered by the figure.