Quadrilaterals

Given a triangular prism then, what can we conclude about the lateral faces ?

Given an equilateral triangle ABC, D, E and F are the mid-points of AB, BC and AC respectively, then the quadrilateral BEFD is exactly a

Given a rectangle ABCD and P, Q, R, S are the mid-points of AB, BC, CD and DA respectively. Length of diagonal of a rectangle is 8 cm. Then the quadrilateral PQRS is a

In a parallelogram ABCD, E and F are the mid-points of sides AB and CD respectively. AF and CE meet the diagonal BD of length 12 cm at P and Q. Then length of PQ is

Which of the following is not a parallelogram ?

Given four points A, B, C, D such that no three points are collinear. By joining these points in order, we get