The figure formed by joining the mid-points of the sides of a quadrilateral ABCD, taken in order, is square only if:
A. ABCD is a rhombus.
B. diagonals of ABCD are equal.
C. diagonals of ABCD are perpendicular to each other.
D. diagonals of ABCD are equal and perpendicular to each other.
Answer:D
The figure formed by joining the mid-points of the sides of a quadrilateral ABCD, taken in order, is square only if:
A. ABCD is a rhombus. B. diagonals of ABCD are equal. C. diagonals of ABCD are perpendicular to each other. D. diagonals of ABCD are equal and perpendicular to each other.