How do I find the area of a triangle?

pea9604 said:
How do I find the area of a triangle?
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There are several formulas, depending on what you know about the triangle -- the side lengths, two sides and an angle, the coordinates of the vertices, and so on.

So a full answer will require a full question: Show us the problem you are working on, tell us what you've learned, and show the work you have tried.
 
If you have the points of the three vertices I like to use determinants. You can view a video on this by clicking here

You can watch the beginning of the video if you like but you definitely want to watch from 12:03
 
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