# Diagonals of a parallelogram

- Author:
- Zoltán Kovács

- Topic:
- Parallelogram

It is well known in elementary Euclidean geometry, that diagonals of a parallelogram bisect each other.

- Observe the construction steps by moving forward in the construction protocol. Scroll down meanwhile in the Algebra View if required.
- Note that definitions of points E and F differ, but they are actually the same.
- Drag point C to various positions. Try to find some positions which cause E to not be equal to F.
- Check whether points E and F are equal by using the Relation Tool (in the 10th toolbox). Click "More" to investigate the situation symbolically.