Let ABCD be a parallelogram. What special name will you give it:
(a) if AB = BC?
(b) if ∠BAD = 90°?
(c) if AB = AD and ∠BAD = 90°?
ABCD is a parallelogram.
(a) ABCD is a rhombus.
(b) ABCD is a rectangle.
(c) ABCD is a square.