 # Surface Area and Volume Class 9

Surface Area and Volume class 9 notes contain detailed and accurate information that will enable students to get a good grip on the concepts discussed in chapter 13 of the maths textbook. Students will also get a glimpse of the important questions and once they get familiar with the notes they will significantly increase their chances of scoring higher marks in the exams. To give you a brief outlook of surface area and volume class 9 Chapter 13 notes, some important definitions, surface area and volume formulas are given below:

• What is Surface Area
• Surface Area Formula of some common solids
• Volume Formula of Some Important Solids
• Examples
• Important Questions

## What is Surface Area?

According to the definition of surface area, it is described as the area of a material that is used in covering a geometric solid. To put it in more simple terms, the surface area is the amount of space covering the outside of a three-dimensional shape.

## What is Volume?

The volume is the sum of how much a figure can retain. In general, volume helps us determine the capacity of a figure. It is measured in cubic units.

## Surface Areas of Common Solids

 Shape Surface Area Formula Variables Cube 6a2 a = side of a cube Cuboid 2(lb+bh+lh) l = length b = breadth h = height Sphere 4πr2 r = Radius Right rectangular parallelopiped 2lw + 2lh + 2wh. l = length w = width h = height Prism 2B +( p x h) B = Area of base h = Height of prism p= perimeter of the base Right Circular Cylinder 2πr(h +r) r  = radius  h = height of cylinder Pyramid B + L B = Area of base L=Lateral Area Right Circular Cone πr(r +√(r2+h2) r  = radius  h = height of a cone

## Volume of Common Solids

 Shape Equation Variables Cube a3 a = side of cube Cuboid lbh l = length b = breadth h = height Sphere 4/3 πr3 r = Radius Right rectangular parallelepiped lwh l = length w = width h = height Prism Bh B = Area of base h = Height of prism Right circular cylinder πr2h r  = radius  h = height of cylinder Pyramid ⅓ Bh B = Area of base h = Height of pyramid Right circular cone ⅓ πr2h r  = radius  h = height of cone

### Surface Area and Volume Class 9 Examples    ### Surface Area and Volume Class 9 Important Questions 