H=3.4s- start with the problem 20=3.4s- substitute the known number(s) 20/3.4=3.4/3.4 s- divide both sides by 3.4 The answer is about 5.88, your answer should be between 5 and 6
part a: if you do the distance formula for points A and B, you get 5
part b: using the distance formula again, points A to B and points A to C are both 5, but points B to C is 6, therefore it's not equilateral because all the sides have to be the same length