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.
