1. The problem statement, all variables and given/known data I'm trying to express the function of a equilateral triangle as a function of the length of a side. All you know is the sides are all equal 2. Relevant equations I have the answer but i dont understand (how and why they got there) and they used the A of a triangle as A= 1/2(base)(height) but I thought it was just 3*L because there is three equal sides. I realize where my confusion is the area of a equilateral triangle, how do they come up with (sq(3)/4)*x it would make more sense for me, if it was 1/3 because there is three sides. 3. The attempt at a solution I know a equilateral triangle has all equal sides, so my initial thought was A= L*3 and as a function wouldnt just f(a)= a*3 work?