2nd Maths Term 1 | Identifying 2D Shapes from 3D Objects

2nd Maths: Term 1 Unit 1 - Geometry

Identification of 2D shapes and 3D objects

Travel Through

Teacher’s Note: Place the objects on a table as given in the picture and fix a cardboard behind the objects. Now glow a torch light from the front side of the objects horizontally and make students see the images of the objects on the cardboard.

Learn

2D impressions of 3D

Take an inkpad.

Press an eraser on the inkpad.

Remove the eraser. Press it on white paper and see the 2D impression.

Teacher’s Note: The teacher can explain that various 2D shapes can be obtained as per the 3D objects used.

Practice

Based on the above activity, fill in the table given below.

Objects used : Shapes formed

Eraser : ______________

Sharpener : ______________

Dice : ______________

Bead : ______________

Click to see the answers

Eraser: Rectangle

Sharpener: Rectangle

Dice: Square

Bead: Circle

Teacher’s Note: Do the activity by using the objects like pencil, sharpner, dice, ball, beads etc., Observe the impression.

Try This

Draw the outline of the objects using pencil. Remove the objects and write the names of the shapes formed.

What shapes did you find?

Bangle: Circle

Book: Rectangle

Dice: Square

Activity

3D figures from 2D shapes

Take triangle, rectangle, circle shaped colour papers. Paste it firmly with a stick and rotate the stick. Observe the 3D figures formed from 2D shapes.

Activity

3D objects using clay

Make the sphere into cylinder, cylinder into cuboid and cuboid into cube by following the instructions given.

1. Make balls using clay.

2. Roll the balls on a tray and cut both the edges to form cylinders.

3. Pat the cylinders to make cuboids.

4. Pat the cuboids to make cubes.

Pleasure Time

Let us join the dots and draw shapes like cube, cuboid, cone and cylinder.

2nd Maths Term 1 Unit 1 | Introduction to 3D Shapes (Geometry)

2nd Maths: Term 1 Unit 1 - Geometry

Introduction to 3 dimensional (3D) shapes

Travel Through: King’s Palace

Animals build a palace for their king, the lion. Each of them brought an item for the palace. Observe the items brought by them.

Keywords: Cube, Cuboid, Cylinder, Cone, Sphere

Match the items brought by the animals as seen in the above picture. One is done for you.

Teacher’s Note: Teacher can narrate the above story of the King’s Palace for enhancing the mathematical vocabulary such as cube, cuboid, cylinder, cone and sphere.

Learn

Cube

The following objects are in the shape of cube.

Cuboid

The following objects are in the shape of cuboid.

Practice

1. Identify the cube and cuboid shaped objects and write ‘A’ for cube and ‘B’ for cuboid inside the box given below.

2. Colour the cube shape red and cuboid shape green.

Learn

Cylinder

The following objects are in the shape of cylinder.

Cone

The following objects are in the shape of cone.

Sphere

The following objects are in the shape of sphere.

Practice

Identify the cylinder, cone and sphere shaped objects and write ‘1’ for cylinder,‛2’ for cone and ‘3’ for sphere.

Try this

Match the objects with their shapes and names of the shapes. Try to solve it on your own before checking the lines!

Click to see the answers

(i) Dice is a Cube.

(ii) Ball is a Sphere.

(iii) Can is a Cylinder.

(iv) Book is a Cuboid.

(v) Party hat is a Cone.

Practice

The names of the objects are given in the boxes. Observe the shapes of the given objects. Write them in the empty squares matching each object. (SPHERE, CONE, CUBE, CYLINDER, CUBOID)

Pleasure Time

Help your toy friends to reach their houses.

Teacher’s Note: Teacher can encourage students to draw the path for the toy children to reach their houses. They need to collect their identical shapes on their way. Example cube, cylinder, sphere, cone, cuboid.

2nd Standard Maths - Term 1 Unit 1: Geometry Explained

2nd Maths : Term 1 Unit 1

Geometry

Recall

Red Carpet welcomes you

Learn

Shape Towers

Pile up the given objects and observe the change in their shapes.

Teacher’s Note: Teacher can involve the children to arrange the given objects such as square, rectangle shaped papers and coins etc., to appreciate the formation of objects formed.