Lateral Area Formulas | List of Lateral Area Formulas You Should Know - BYJUS

# Lateral Area Formula

The lateral area of any solid object is defined as the area of the lateral faces of the solid. In this article we will explore the formulas used to calculate the lateral area of various solid shapes....Read MoreRead Less

### Formula for the Lateral Area of Solids

The lateral area formula is different for different solid shapes. In the lateral area formula, the base area of the object as well as that of the face parallel to the base are not included.

The lateral area is also referred to as the lateral surface area (LSA) and is always measured in square units.

### Formula for the Lateral Area of Cuboids and Cubes

For a cuboid: Lateral Area = 2 (length + breadth) × height.

For a cube: Lateral Area = 4 × (side)$$^2$$ .

### Formula for the Lateral Area of a Cylinder

Lateral area = 2 × π × r × h =  2πrh, where ‘r’ is the base radius and ‘h’ is the height of the cylinder.

### Formula for the Lateral Area of a Cone

Lateral Area =  = πrl

where ‘r’ is base radius and ‘l’ is slant height of the cone.

### Formula for the Lateral Area of a Sphere

For a sphere the lateral surface area is its curved surface area.

Lateral Area = 4πr$$^2$$

where ‘r’ is the radius of the sphere.

### Formula for the Lateral Area of a Hemisphere

For a hemisphere the lateral surface area is its curved surface area.

Lateral Area = 2πr$$^2$$

where ‘r’ is the radius of the hemisphere.

### Rapid Recall ### Solved Examples

Example 1: Calculate the lateral surface area of a cuboid with dimensions of 8 units, 4 units, and 12 units respectively.

Solution:

As stated in the question,

Length of the cuboid = 8 units

Breadth of the cuboid = 4 units

Height of the cuboid = 12 units

According to the formula,

Lateral area of cuboid = 2 (length + breadth) × height

Substituting the values in the formula,

Lateral area = 2 (8 + 4) x 12

= 2 (12) x 12

= 24 x 12

= 288

Hence, the lateral area of the cuboid is 288 square units.

Example 2: Anthony bought a spherical ball of radius 16 cm. Find its lateral area. Can you find the lateral area of the spherical ball if it is divided into two equal parts?

Solution:

The details already provided,

Radius of the spherical ball = 16 cm

According to the lateral area formula,

Lateral area of sphere = 4πr$$^2$$

Substituting the value of ‘r’ and 3.14 for π in the formula,

Lateral area = 4 x 3.14 x (16)$$^2$$

= 3215.36

Hence, the lateral area of the spherical ball is 3215.36 square centimeters.

Now, if the spherical ball is divided into two equal parts, then we need to find the lateral area for the hemisphere.

As we know, the lateral area formula for a hemisphere is given by, Lateral area of hemisphere = 2πr$$^2$$

Substituting the values in the formula,

Lateral area = 2 x 3.14 x (16)$$^2$$

= 1607.68 cm

Hence, the lateral area for the sphere is 3215.36 cm² and the lateral surface area of a hemisphere is 1607.68 cm² respectively.

Example 3: Find the lateral area of a cylinder with radius 8 units and height 14 units. Take π = $$\frac{22}{7}$$.

Solution:

As provided,

Radius of the cylinder = 8 units

Height of the cylinder = 14 units

According to the lateral area formula of a cylinder,

Lateral area = 2πrh

Substituting the values in the formula,

Lateral area = 2 x $$\frac{22}{7}$$ x 8 x 14

= 2 x 22 x 8 x 2     [Simplify]

= 704                     [Simplify further]

Therefore the lateral area of the given cylinder is 704 square units.