Chapter 13 · Class 9 CBSE · Formula Sheet
Surface Areas & Volumes Formulas — Class 9 CBSE
Calculate surface area and volume of cubes, cuboids, cylinders, cones, and spheres.
Key Formulas
CSA of Cone
\text{CSA} = \pi r l
TSA of Cone
\text{TSA} = \pi r(r + l)
Volume of Cone
V = \dfrac{1}{3}\pi r^2 h
Slant Height of Cone
l = \sqrt{r^2 + h^2}
Surface Area of Sphere
\text{SA} = 4\pi r^2
Volume of Sphere
V = \dfrac{4}{3}\pi r^3
CSA of Hemisphere
\text{CSA} = 2\pi r^2
TSA of Hemisphere
\text{TSA} = 3\pi r^2
Volume of Hemisphere
V = \dfrac{2}{3}\pi r^3
Worked Examples
1Using: Area of Rectangle
Find the area of a rectangle with length 12 cm and breadth 5 cm.
Step 1: Area = l x b
Step 2: = 12 x 5 = 60 sq. cm.
Answer: 60 sq. cm
2Using: Perimeter of Square
Find the perimeter of a square with side 8 m.
Step 1: Perimeter = 4a
Step 2: = 4 x 8 = 32 m.
Answer: 32 m
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