Class 8 Maths – Chapter 11

Mensuration

STEP 1: Foundation Notes (Basics)

Mensuration is the branch of mathematics that deals with the measurement of:

• Length
• Area
• Surface Area
• Volume

📐 2D Shapes (Flat Shapes)

2D shapes have only length and breadth.

• Square
• Rectangle
• Triangle
• Circle

We calculate:

• Perimeter
• Area

📦 3D Shapes (Solid Shapes)

3D shapes have length, breadth and height.

• Cube
• Cuboid
• Cylinder
• Cone
• Sphere

We calculate:

• Surface Area
• Volume

📝 Important Terms

Perimeter: Total distance around a shape.

Area: Region covered by a shape.

Surface Area: Total area of all faces of a solid.

Volume: Space occupied by a solid.

📏 Units Used

• Length → cm, m
• Area → cm², m²
• Volume → cm³, m³

🎯 Exam Note

Mensuration questions usually carry high marks and are formula-based. Writing steps clearly gives full marks.