Q1
How many faces does a cube have?
ASix
BFour
CEight
DTwo
SSCClass 6 (SSC)Mathematics (गणित)Ch 18 · Topic 1
Three Dimensional Shapes
Three-dimensional shapes like cubes, cuboids, cylinders, cones, and spheres have length, width, and height, unlike flat 2D shapes.
Core concept
A cube has six equal square faces, while a cuboid has six rectangular faces, both with straight edges and flat surfaces.
How it works
A cylinder has two circular flat faces and one curved surface, like a can, while a cone has one circular base and a pointed top.
Why it matters
A sphere is perfectly round with no edges or flat faces, like a ball, having the same distance from its centre to all surface points.
Key detail
Understanding 3D shapes helps us recognise objects around us and prepares us for calculating their surface area and volume.
Exam highlight
Key diagram
Keywords worth remembering
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Quick notes
• Cube: 6 equal square faces.
• Cuboid: 6 rectangular faces.
• Both have straight edges, flat surfaces.
• Cylinder: 2 circular faces, 1 curved surface.
• Cone: 1 circular base, pointed top.
• Sphere: perfectly round, no edges/flat faces.
• 3D shapes have length, width, height.
• Understanding them prepares for area/volume calculation.