a parallelogram is a rectangle if and only if
a parallelogram is a rhombus if and only if
a trapezoid is isosceles if and only if
area addition postulate
area congruence postulate
area of a kite
area of a rhombus
area of a square
if a quadrilateral is a kite
if a trapezoid is isosceles
if both pair of opposite sides are parallel
if both pairs of opposite angles are congruent
if both pairs of opposite sides are congruent
if one pair of opposite sides are congruent and parallel
if the diagonals bisect each other
is one angle is supplementary to both consecutive angle
kite
midsegment theorem for trapezoids
rectangle
rhombus
square