Question 318522: Find the area of an equilateral triangle that has a perimeter of 21 inches. Round the answer to one decimal place. Found 3 solutions by Earlsdon, mananth, Fombitz:Answer by Earlsdon(6287) (Show Source):
You can put this solution on YOUR website! You could use Heron/Hero's formula for finding the area of a triangle when you know the lengths of the three sides, a, b, and c.
s = the semi-perimeter of the triangle.