In this post, we will explore the area of a circumscribed equilateral triangle. A circle has a radius of 6 in and an equilateral triangle with an altitude of 12 in is circumscribed about it. The area of the circle is pi*r^2 or 18pi sq in while the area of the triangle can be found by using one side multiplied by two other sides as follows: (12sq in) *(3sqin)*(6 sqin)=54 sqin. Area of a Circumscribed Equilateral Triangle: area of the circle is pi*r^22 or 18pi sq in. The area of the triangle can be found by using one side multiplied by two other sides as follows:(12sq in) *(36in-radius)*(18in-height)=54 sqin. The Area of a Circumscribed Equilateral Triangle written on 01/21/2018 at 03:00pm UTC+0 from your post editor (article content changes will not show up). If you like this article, please share and comment below! In this post, we explore how to calculate the area for a circumscribed equilateral triangle with an altitude of 12 inches. A circle