Pythagorean theorem a2 + b2 = c2 You have to know at least two of the sides See the below link http://en.wikipedia.org/wiki/Pythagorean_theorem
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If it is a right triangle, you can use the Pythagorean theorem to find the height since it will be on of the sides. If it is an equilateral triangle, you can break it up into two right triangles and use the part above. If it is an oblique triangle, you use the angles and some trigonometry to find it. Since the area is 1/2 b x h, if you are given the area, you can solve for the height.
The height of a triangle is the point from the base to the upmost point of the triangle. On a right triangle, it is measured on the the longest side that makes a right angle. Thanks for using Answers.com!
Area=1/2(base*height) where either side can be the base or the height in a right triangle.
Simple. Just multiply the base by the height of the triangle, and divide it into two. This works for all types of triangles.
to find the area of any triangle follow the formula: 1/2(b*h) "B" - stands for the base of the triangle "H" - stands for the height of the triangle