# A variable parallelogram

- Author:
- Beatrice Tiron

- Topic:
- Parallelogram, Rectangle

[ABCD] is a parallelogram with AC = a and BD = ab, where b is variable from 0 to 1. So, if b = 1 then [ABCD] is a rectangle. Also, if AC is perpendicular on BD, then [ABCD] is a romb.