The area of the equilateral triangle then is twice this area which is h2sq root 3. It is important to remember any of the sides of an equaliateral triangle can be used as the base when the hieght is given. So to find the area of an equilateral triangle with only its height one must square the height and divide by sq root 3.
Since AD is also the perpendicular to BC we can use the Pythagorean theorem to determine its length which is the height of the triangle corresponding to the side BC.
The area can be found by 6 x 45 divided by 2. To find the area of an equilateral triangle or a triangle with 3 equal sides all you have to do is to. This geometry video tutorial explains how to calculate the area of an equilateral triangle as well as how to derive the formula. The area of an equilateral triangle all sides congruent can be found using the formula where s is the length of one side of the triangle.