Why are circles so important to the construction of equilateral triangles?

Julia is going for a walk through the neighborhood. what unit of measure is most appropriate to describe the distance she walks?

Which set of lengths could represent the sides of a triangle? a. 3, 7, 10 b. 4, 5, 10 c. 6, 8, 14 d. 12, 6, 7

Ateam of runners is needed to run a 1 2 -mile relay race. if each runner must run 1 4 mile, how many runners will be needed?