Good link here:
https://en.wikipedia.org/wiki/Varignon's_theorem
contains a proof which is easy to follow
The Varignon parallelogram of the Varignon parallelogram of quadrilateral ABCD is a 3*4 rectangle. Find AC+BD.
I don't understand the Varignon parallelogram, so solving this problem is difficult.
2 answers
Shut up dweeb and study U fool