Class 8 Math: Mensuration Quick Revision Chapter Summary

Need to review the entire chapter before a test? This quick revision guide summarizes all the core concepts, topics, and equations taught in Class 8 Mensuration to help you refresh your memory instantly.

Core Topics At a Glance

### 📌 Area of Trapezium The area of a trapezium is half the sum of its parallel sides multiplied by the perpendicular height.

### 📌 Area of general quadrilateral and polygon shapes The area of a general quadrilateral is found by drawing a diagonal and summing the areas of the two triangles formed. Polygons are split into triangles and trapeziums to calculate area.

### 📌 Surface Area of Cube, Cuboid, and Cylinder Total surface area is the sum of the areas of all faces of a 3D solid.

### 📌 Volume of Cube, Cuboid, and Cylinder Volume measures the 3D space occupied by a solid. Cylinder volume is base area (circle) multiplied by height.

### 📌 Volume and Capacity conversion Volume is the space occupied by an object. Capacity is the volume of liquid a container can hold.

Key Formulas Mind Map

• Area of Trapezium: `A = \frac{1}{2}(a+b)h` - Half the sum of parallel sides times perpendicular height h....
• Volume of Cylinder: `V = \pi r^2 h` - Base circle area times height....
• Total Surface Area of Cylinder: `TSA = 2\pi r(r + h)` - Curved surface area plus two flat bases....

Revision Checklist

1. Review the subtopic guides and outline notes.
2. Practice writing the key formulas from memory.
3. Solve at least 3 worked examples and check your steps.
4. Take a timed practice quiz to verify your speed.