If ΔABC ≅ ΔEDF where the coordinates of A(−1, 1), B(2, 4), and C(3, 1), what is the measure of EF?

Answer 1

Since ΔABC ≅ ΔEDF, EF ≅ AC, ED ≅ AB, and DF ≅ BC

Length of EF = √[(3-(-1))² + (1-1)²] = 4

Answer 2

What's the scale of the triangles? I know nothing about EDC.