Area List

I have to find the area of a triangle, but it didn’t give me the height, just the measure of one base. But the triangle is an equilateral triangle, so is there a special formula that works for equilateral triangles?
The base is the height.
Bh1/2

I have to do an experiment for my ecology class, and I want to compare something in two different areas. The example was comparing spider composition in a wooded area versus a field area. I am trying to think of other types of areas other than "wooded" or "field" that I could potentially use. Thank [...]