2D and 3D Shape
2 Minutes
2D and 3D shapes for kids: learn how points form polygons, how height turns 2D into 3D, and why real objects use specific shapes. A Tamil maths lesson.
- Connecting points to form triangles, quadrilaterals, and hexagons
- Adding height to turn 2D shapes into 3D books, cubes, and pyramids
- Why wheels are circles and floor tiles are square
What this lesson teaches
Two-dimensional shapes are flat figures defined only by length and breadth, while three-dimensional shapes also include height. Everyday items such as toys, floor tiles, and vehicle wheels are built in distinct geometric shapes to serve specific practical purposes.
Forming flat shapes from points and lines
- A dot placed on a surface is called a point, and connecting two points forms a line segment.
- Connecting three points creates a triangle, while connecting four points forms a quadrilateral.
- Four sticks of the same size arranged at ninety-degree angles form a square, and lengthening two opposite sides forms a rectangle.
- Slanting the four sticks away from ninety degrees forms a parallelogram, and the same sticks can also create a rhombus or a trapezium.
- Joining five sticks forms a pentagon, while joining six sticks creates a six-sided shape called a hexagon.
Differences between 2D and 3D shapes
Two-dimensional shapes possess only two dimensions, which are length and breadth, just like a single flat sheet of paper. When flat sheets of paper are stacked one on top of another, they form a book, which is a three-dimensional shape with length, breadth, and height. In the same way, adding height to a square creates a three-dimensional cube, such as a Rubik's cube. Adding height to a triangle creates a three-dimensional pyramid, like the pyramids in Egypt where mummies rest.
Why objects have specific shapes
- Beehives are shaped like hexagons so that bees can store a large amount of honey in a smaller amount of space.
- Circles have no specific sides and no angles, which is why vehicle wheels are circular so that they do not bounce and jolt while moving.
- Floor tiles are made as squares so they fit together cleanly, whereas circular tiles would leave empty gaps across the floor.
- Everyday items such as biscuits, chocolates, and toys in stores each have a particular shape designed for a clear purpose.