NCERT Mathematics Class 2 - Chapter 1: What is Long, What is Round - Notes

क्या लंबा, क्या गोल

Learning Objectives

  • Identify flat and solid shapes in everyday objects
  • Tell the difference between round, long, and flat shapes
  • Recognise shapes like cylinder, sphere, cone, and cuboid
  • Sort objects by their shapes
  • Describe objects using shape words

Key Concepts

Round Objects

Many things around us are round. A ball is perfectly round on all sides — this shape is called a sphere. A lemon and an orange are also round like a sphere. The earth we live on is round too. Round objects can roll easily on the ground.

Long and Round Objects

Some objects are long and round at the same time. A log of wood, a candle, and a pipe are long and round. This shape is called a cylinder. A cylinder has two flat circles at each end and a curved surface around it. A tin can and a glass are also shaped like cylinders.

Flat Objects

Some objects are flat. A book, a box, and a brick are flat with sharp edges. These shapes are called cuboids. A cuboid has flat faces, straight edges, and corners. A dice is a special cuboid where all sides are equal — it is called a cube.

Pointed Objects

Some objects have a point on top. An ice cream cone, a birthday cap, and a funnel are pointed at one end. This shape is called a cone. A cone has a flat circle at the bottom and comes to a point at the top.

Shapes that Roll and Shapes that Slide

Round shapes like spheres and cylinders can roll. Flat shapes like cubes and cuboids cannot roll — they slide. A cone can roll in a curved path. This is why wheels are round — they roll smoothly.

Important Terms

  • Sphere: A perfectly round shape like a ball
  • Cylinder: A long round shape like a tin can
  • Cone: A shape with a flat circle at one end and a point at the other
  • Cuboid: A box-like shape with flat faces and sharp corners
  • Cube: A special cuboid where all faces are equal squares
  • Roll: To move by turning over and over
  • Slide: To move smoothly along a surface without turning

Quick Revision

  • Ball = sphere (round), Can = cylinder (long and round), Box = cuboid (flat)
  • A sphere can roll in any direction
  • A cylinder can roll in a straight line
  • A cuboid can only slide, not roll
  • A cone has a pointed top and a round bottom
  • Look around your home and sort objects into these shape groups
NCERT Mathematics Class 2 - Chapter 1: What is Long, What is Round - Notes | EduMunch