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