2000005504

SubArea: 
Polygons
Level: 
A
Project ID: 
2000005504
Accepted: 
0
Clonable: 
0
Easy: 
1
Let ABCD be an arbitrary convex quadrilateral and let’s denote by P, Q, R, S the centers of the sides AB, BC, CD, DA in that order. Then, what type of a quadrilateral is PQRS?
It may or may not be a parallelogram.
It is a rectangle.
It is a rectangle or a square.
It is not a parallelogram.