Working with Pythagorean Triple Triangles
Identifying the 30 – 60 – 90 Degree Triangle
Finding the Altitude of a Triangle

Determining the Area of an Equilateral Triangle

To calculate a triangle’s area — for most types of triangles — you need to know the triangle’s base and height. However, with an equilateral triangle, all you need to know is the length of one of its sides. You can then plug it into the following formula to quickly calculate the area.

Area of an equilateral triangle (with side s):

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Here’s the formula in action:

What’s the area of a triangle HOG whose sides measure 20 units?

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Determining a Triangle's Area from Its Base and Height
Determining a Triangle's Area from Its Three Sides
Identifying Triangles by Their Angles
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