The area of a triangleThis page provides step by step directions and many sample problems of finding the area of a triangle

Area of a Triangle/Math Expression This is a very helpful page. Neat,easy to follow, and includes videos,sample problems, and pictures for finding the area of a triangle.

How do you find the area of a triangle? There are several methods for finding the area of a triangle. The most commonly used equation for the area of a triangle that works for all triangles is one half base times height.

1/2 b*h

b = base

h = height

Below are videos that show an example of each different method.

->The left hand column is the needed information.

->The video shows an example problem explaining how to find the area of a triangle with the given information.

Choose the video from the handy chart that best helps you find the area of the triangle based on the information you are given.

If you know ...

Use the following Method

Half Base times Height

An acute triangle has a height of 5 units and a base of 10 units. What is the area of this triangle?

Solution:

Area = ½ (10) *(5)

A = ½ (50)

A = 25 units^2 Remember area is always units squared

Find the area of a triangle with sides of 5 units,6 units, and 7 units.

With this example you can use Heron’s formula.

Solution:

Find S 5+6+7/2 = 18/2 = 9

Area = √(9(9-5))9-6)(9-7))

√(216 )=14.6868 units^2

Find the area of an equilateral triangle with of 4 units.