Class 3 Exam  >  Class 3 Notes  >  Mathematics for Class 3 (Maths Mela)  >  Chapter Notes: Fun with Shapes

Fun with Shapes Chapter Notes | Mathematics for Class 3 (Maths Mela) PDF Download

Introduction

Shapes are the basic elements of everything around us! You can think of a shape as a special design that you can see and touch. The world is filled with interesting shapes, each one telling its own story. From the roundness of a ball to the sharp edges of a triangle, shapes are all around us! Let’s dive into the amazing world of shapes together!

Fun with Shapes Chapter Notes | Mathematics for Class 3 (Maths Mela)

Rectangle

A rectangle is a shape with four sides where opposite sides are the same length, and all the angles are right angles.

Fun with Shapes Chapter Notes | Mathematics for Class 3 (Maths Mela)

Question for Chapter Notes: Fun with Shapes
Try yourself:
Which of the following objects is most likely to be in the shape of a rectangle?
View Solution

Parts of a Rectangle:

  • Sides: Rectangles have four sides. The longer sides are called the length, and the shorter sides are called the breadth.
  • Corners: Rectangles have four corners where two sides meet at right angles, giving the shape a sharp and clear look.

Common objects that are rectangles include a blackboard, a TV screen, and a ruler. These items are often found in our daily lives and have specific uses.

Fun with Shapes Chapter Notes | Mathematics for Class 3 (Maths Mela)

Square

A square is a unique kind of rectangle and also a four-sided shape where all four sides are the same length.

Fun with Shapes Chapter Notes | Mathematics for Class 3 (Maths Mela)

Parts of a Square:

Fun with Shapes Chapter Notes | Mathematics for Class 3 (Maths Mela)

  • Sides: Squares have four equal sides, meaning each side is the same length.
  • Corners: The corners of a square form right angles (90 degrees).

Squares are used in many real-life situations, including architecture and design.

Fun with Shapes Chapter Notes | Mathematics for Class 3 (Maths Mela)

Similarities in Rectangle and Square

Both squares and rectangles are four-sided shapes, but a square is actually a special kind of rectangle! Here's what they have in common:

Key Similarities

  • Number of Sides: Both shapes have four sides.
  • Opposite Sides: In both shapes, opposite sides are equal in length. In a rectangle, all sides do not have to be equal; it is sufficient for only the opposite sides to be equal.
  • Corners: Both shapes have four corners, which are right angles.

Triangle

A triangle is a shape with three sides and three corners. It looks like a slice of pizza or a traffic sign.

Fun with Shapes Chapter Notes | Mathematics for Class 3 (Maths Mela)

Parts of a Triangle:

  • Sides: Triangles have three sides. Each side is a straight line that connects two corners.
  • Corners (Vertices): Triangles have three corners where the sides meet. These corners are called vertices. Each vertex is where two sides come together.
  • For Example: Slice of Pizza, Pyramid, Slice of watermelon

Fun with Shapes Chapter Notes | Mathematics for Class 3 (Maths Mela)

Circle

Think of a circle as a round cookie. It's a shape with no corners, and when you draw it, you start at one point and go all the way around until you return to the start.

Fun with Shapes Chapter Notes | Mathematics for Class 3 (Maths Mela)

The centre of a circle is the point that is the same distance from every point on the edge, called the circumference. If you draw lines from the centre to the edge, they will all be equal in length. This distance is known as the radius.

Fun with Shapes Chapter Notes | Mathematics for Class 3 (Maths Mela)

The diameter is two times the radius and is the longest line that passes through the centre. The total distance around the circle is called the circumference.

Question for Chapter Notes: Fun with Shapes
Try yourself:
What is a shape with three sides and three corners called?
View Solution

Combination of Shapes

We can make all sorts of things by combining different shapes creatively. Here are a few examples:

1. House: A house can be made using rectangles for the walls, a triangle for the roof, squares or rectangles for windows, and circles for doorknobs or windows.

Fun with Shapes Chapter Notes | Mathematics for Class 3 (Maths Mela)

2. Car: A car might have rectangles for the body, circles for wheels, and triangles for headlights or the hood.

Fun with Shapes Chapter Notes | Mathematics for Class 3 (Maths Mela)

3. Tree: A tree can be made using a rectangle for the trunk, circles for leaves, and triangles for branches.

Fun with Shapes Chapter Notes | Mathematics for Class 3 (Maths Mela)

4. Robot: A robot could have rectangles for the body and limbs, circles for eyes or buttons, and triangles for decorations or parts of its design

Fun with Shapes Chapter Notes | Mathematics for Class 3 (Maths Mela)

5. Rocket: A rocket might use cylinders for the body, cones for the top or nose, rectangles for fins, and circles for windows or portholes.

Fun with Shapes Chapter Notes | Mathematics for Class 3 (Maths Mela)

By combining shapes in different ways, we can create all sorts of objects, from everyday things like houses and cars to imaginative creations like robots and rockets! It's like putting together pieces of a puzzle to build something new and exciting.

How Shapes are Formed?

With this pencil, you can draw different shapes! There are two main types of lines you can use to draw these shapes:

Two Main Types of Lines

Fun with Shapes Chapter Notes | Mathematics for Class 3 (Maths Mela)

  • Straight lines are like the edges of a square or a rectangle. They don't bend or curve; they just go straight from one point to another.
  • Curved lines are like the edges of a circle or an oval. They bend and are not straight. They can be round or stretched out like an oval.

Shapes can also have different angles, which are important for classifying them. For example:

  • A triangle has three angles.Fun with Shapes Chapter Notes | Mathematics for Class 3 (Maths Mela)
  • A rectangle has four right angles.Fun with Shapes Chapter Notes | Mathematics for Class 3 (Maths Mela)

When you combine straight and curved lines in various ways, you can create all sorts of shapes like triangles, circles, squares, and rectangles. It's like using building blocks to create different structures!

Question for Chapter Notes: Fun with Shapes
Try yourself:
What type of lines are like the edges of a circle or an oval?
View Solution

Tangram

A Tangram is a puzzle made up of seven different shapes. These shapes include:

  • One big triangle
  • One medium triangle
  • One small triangle
  • One big square
  • One medium square
  • Two small squares

You can use these shapes to create a variety of pictures and designs.

Fun with Shapes Chapter Notes | Mathematics for Class 3 (Maths Mela)

To make a tangram:

  • Get a square piece of paper and something to draw with, like crayons or markers.
  • First, draw a big square on the paper.
  • Next, draw lines inside the big square along the indicated dotted lines to create four triangles.
  • After that, draw the remaining shapes to complete the tangram.

Fun with Shapes Chapter Notes | Mathematics for Class 3 (Maths Mela)

Now you can:

  • Cut out the shapes along the lines you drew.
  • Once you have all the pieces, start arranging them to create different pictures and patterns.
  • Join three triangles together to make as many different shapes as you can.
  • Challenge yourself by trying to join four triangles together.

Let's Practice! 

Question 1: 

Fun with Shapes Chapter Notes | Mathematics for Class 3 (Maths Mela)

Fun with Shapes Chapter Notes | Mathematics for Class 3 (Maths Mela)  View Answer

Answer:
Triangles have three sides. They have three corners


Question 2: 
Aditya made three squares with 10 matchsticks.
How many squares can you make with 12 matchsticks?
Fun with Shapes Chapter Notes | Mathematics for Class 3 (Maths Mela)

Fun with Shapes Chapter Notes | Mathematics for Class 3 (Maths Mela)  View Answer

Answer:
We can make 4 squares with 12 match-sticks.
Fun with Shapes Chapter Notes | Mathematics for Class 3 (Maths Mela)

The document Fun with Shapes Chapter Notes | Mathematics for Class 3 (Maths Mela) is a part of the Class 3 Course Mathematics for Class 3 (Maths Mela).
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FAQs on Fun with Shapes Chapter Notes - Mathematics for Class 3 (Maths Mela)

1. What is the difference between a rectangle and a square?
Ans.A rectangle has opposite sides that are equal in length, while a square has all four sides equal in length. Additionally, all angles in both shapes are right angles (90 degrees).
2. How are rectangles and squares similar?
Ans.Both rectangles and squares have four sides and four right angles. They are also both classified as quadrilaterals, and a square is actually a special type of rectangle.
3. What is a circle and how is it different from rectangles and squares?
Ans.A circle is a shape with all points equidistant from a central point, called the center. Unlike rectangles and squares, which have straight sides and angles, a circle has a curved boundary and no corners.
4. How can various shapes be combined to create new shapes?
Ans.Shapes can be combined by placing them next to each other or overlapping them. For example, two triangles can be combined to form a square, or a rectangle can be made by joining two squares.
5. What is a Tangram and how does it relate to shapes?
Ans.A Tangram is a dissection puzzle consisting of seven flat pieces called tans, which can be arranged to form various shapes. It helps in understanding the properties of different shapes and how they can fit together.
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