Area of a Triangle

Lesson Objective
In this lesson, we will learn about the area of a triangle.
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.

Study Tips

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:

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.
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:

Acute Triangle

Right Triangle

Obtuse Triangle

Math Video

Lesson Video
Math Video Transcript

Practice Questions & More

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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