Class 4 Maths - BIHAR
Shapes Around Us
The chapter 'Shapes Around Us' introduces Class 4 students to basic geometrical shapes like rectangles, squares, circles, triangles, and basic 3D solids such as cubes, cuboids, cylinders, and spheres. Students learn to identify, count, and differentiate between corners (vertices), edges, and faces of these shapes using objects found in everyday life. This chapter is fundamental for building spatial awareness and forms the bedrock of geometry for Bihar School Examination Board (BSEB) exams. Mastering these basic concepts helps students score well in objective and short-answer questions in primary mathematics.
Start Learning FreeKey Concepts
Plane Shapes (2D Shapes)
Flat shapes like squares, rectangles, triangles, and circles that have only two dimensions: length and breadth.
Solid Shapes (3D Shapes)
Objects that take up space, such as cubes, cuboids, cylinders, cones, and spheres, having length, breadth, and height.
Vertices (Corners)
The point where two or more straight lines or edges meet to form a corner in a shape.
Edges and Faces
An edge is where two faces meet, and a face is the flat or curved surface of a solid shape.
Important Formulas
Board Exam Info
In the Bihar (BSEB) Class 4 Mathematics examinations, this chapter typically carries around 6 to 8 marks. Common question types include matching objects to their respective shapes, counting the number of corners and edges in given figures, and filling in the blanks regarding properties of 2D and 3D shapes.
Frequently Asked Questions
What is the difference between a 2D shape and a 3D shape?
2D shapes are flat and can only be drawn on paper (like a square), while 3D shapes are solid objects that take up space (like a cube or a ball).
Does a circle have any corners?
No, a circle is a completely round shape and has zero corners and zero straight edges.
How many corners does a cuboid have?
A cuboid has 8 corners (vertices), just like a cube.
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