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.
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?
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.
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.