a). Rohmbus is a quadrilateral. - Always
Since, any polygon with four sides are known as quadrilateral
b). A rectangle is a rohmbus, - Never
A rohmbus have all the sides equal where as in rectangle only opposite sides are equal.
c). Adjacent sides of rectangle are congurent - Always
In rectangle the opposite sides are always equal, so they are congurent.
d). Diagonals of square are perpendicular-Never
Diagonals bisect angle of the square, i,e they bisect 90 degrees angle into 45 degrees
e). Diagonals of parallelogram are congurent-Always
Diagonals bisect the angle, so they are congurent.
f). If ABCD is parallelogram then , AB is congurent to CD -Always
since, Opposite sides of parallelogram are always equal and are congurent.
g). Square is a rectangle - Sometimes,
In square all the sides are equal where in rectangle only opposite sides are equal, so
square can be rectangle.
h). A parallelogaram is a rohmbus - Sometimes
A parallelogaram is a rohmbus is all the sides of parallelogaram is equal.
i). A rohmbus is a square, -Sometimes
A rohmbus is a squre if every angle made by the sides are equal to 90 degrees.