In the figure given below O is the center of the circle. ABCD can never be a -
Square
Rhombus
Trapezium
Quadrilateral
ABCD can never be a square, since centre of circle doesn't lie on AC so it cannot be a diameter ∠ABC cannot be equal to 900.
The figure formed by joining the midpoints of the sides of a quadrilateral ABCD, taken in order, is a square, only if
(a) ABCD is a rhombus
(b) diagonals of ABCD are equal
(c) diagonals of ABCD are perpendicular
(d) diagonals of ABCD are equal and perpendicular