Question

Find coordinates of triangle vertices by midpoint coordinates

Answer 1

Let A, B and C be vertices of the triangle. Let D, E and F be the midpoints of AB , BC and CA respectively.

Let D(x1, y1). E=(x2, y2).. F = (x3, y3).

Then
A = (x1-x2+x3, y1-y2+y3)

B = (x1-x3+x2, y1-y3+y2)

C = (x2-x1+x3, y2-y1+y3).

This is the way to find..