lateral surface area


Definition of Lateral Surface Area

  • Lateral surface area in a solid is the sum of the surface areas of all its faces excluding the base of the solid.

More about Lateral Surface Area

  • Lateral surface area of a cube = 4b2, where b is the base of a cube
  • Lateral surface area of a sphere is 4πr2, where r is the radius of the sphere.
  • Lateral surface area of a cone = π × r × l, where r and l are the radius and slant height of the cone
  • Lateral surface area of a cylinder = 2πrh, where r is the radius and h is the height of the cylinder
  • Lateral surface area of the right triangular pyramid = 3 × area of lateral faces
  • Lateral surface area of a pentagonal prism = 5 × area of each rectangle

Example of Lateral Surface Area

  • Let’s find out the lateral surface of a cone that has a base radius (r) of length 6 yd and a height (h) of 8 yd.
    Lateral surface area of the cone = πrl
    Slant height of the cone, l = [l =.]
    = 10 yd
    Lateral surface area = 3.14 × 6 × 10 [As r = 6 and h = 10]
    = 188.4
    So, the lateral surface area of the cone = 188.4 sq yd.

Solved Example on Lateral Surface Area

Find the lateral surface area of a pentagonal prism, if a = 5 cm and b = 14 cm.

Choices:
A. 330 cm2
B. 95 cm2
C. 350 cm2
D. 370 cm2
Correct Answer: C
Solution:
Step 1: In the given figure, the base of the prism is a regular pentagon.
Step 2: All five rectangles are congruent.
Step 3: Lateral surface area of the prism = 5 × area of each rectangle
Step 4: = 5 × 5 × 14 [Substitute the values.]
Step 5: = 350 [Simplify.]
Step 6: Lateral surface area of the pentagonal prism = 350 cm2.

Related Terms for Lateral Surface Area

  • Area
  • Base
  • Breadth
  • Cone
  • Cube
  • Cylinder
  • Face
  • Height
  • Prism
  • Pyramid
  • Radius
  • Solid
  • Sphere
  • Surface Area