Area of a Triangle

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Lesson Objective
In this lesson, we will learn about the area of a triangle.
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About This Lesson
In this lesson, we will:
  1. Learn about the formula for the area of a triangle.
  2. See an example on using the formula to find a triangle's area.
  3. See another example on using the formula to find the height of a triangle.
The study tips and math video below will explain more.
a triangle

Study Tips

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Tip #1 - Area Formula
A triangle is a three sided polygon. Consider a triangle with the base b and the height h. With this, the area A, of this triangle will be:
area of a triangle formula
a triangle with base b and height h

Note that, this formula only works if the triangle's height is perpendicular to its base. The study tip and math video below will explain more.
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Tip #2 - Example Triangles
Now, to use this formula, we have to make sure that the height of the triangle is perpendicular to its base. The pictures below show three triangles with their respective base b and height h:
an acute triangle
Acute Triangle
a right triangle
Right Triangle
an obtuse triangle
Obtuse Triangle

Math Video

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Lesson Video
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Math Video Transcript

Practice Questions & More

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Multiple Choice Questions (MCQ)
Now, let's try some MCQ questions to understand this lesson better.

You can start by going through the series of questions on the area of a triangle  or pick your choice of question below.
  1. Question 1 on finding the area of a triangle
  2. Question 2 on finding the height of a triangle 
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