Heron's Formula
Area of a Triangle from SidesYou can calculate the area of a triangle if you know the lengths of all three sides, using a formula that has been know for nearly 2000 years. It is called "Heron's Formula" after Hero of Alexandria (see below) |
Step 1: | Calculate "s" (half of the triangles perimeter) using: | |
Step 2: | Then calculate the Area using: |
Example: What is the area of a triangle where every side is 5 long?
Step 1: s = (5+5+5)/2 = 7.5
Step 2: A = √(7.5 × 2.5 × 2.5 × 2.5) = √(117.1875) = 10.825...
Try it yourself:
Angles
In the calculator above I also used the Law of Cosines to calculate the angles (to provide a complete solution). The formula is:
Where "C" is the angle opposite side "c".