1. Divide the length of the base by two. Represent this number as y. 2. Add the square of y to the square of the height of the triangle. 3. Take the square root of the number obtained
http://www.ehow.com/how_8402806_calculateisoscele...

1. Find the base and height of your triangle. The base of the triangle is the length of one side, which is usually the bottom side of the triangle. The height is the length from the
http://www.wikihow.com/CalculatetheAreaofaTri...

You have to multiply the base times the height and then divide that by 2.
http://wiki.answers.com/Q/What_is_the_formula_to_c...
