A rhombus is a parallelogram with __ ________________ ___________. A rectangle is a parallelogram with ___ __________ ____________. A square is a parallelogram with ____ ______________ ______________and ___ _____________ ________________. 4 congruent sides angles right 4 4 congruent sides anglesright 4

 Example 1 Draw a rhombus QRST, and then decide whether each statement below is always or sometimes true. a. b. Q R S T

 A parallelogram is a rhombus if and only if its diagonals are __________________. perpendicular

A parallelogram is a rhombus if and only if each ________________ ___________ a pair of __________________ angles. A parallelogram is a rectangle if and only if its diagonals are __________________. congruent opposite bisectsdiagonal

ParallelogramRectangleRhombusSquare Diagonals Bisect Each Other Diagonals are Equal In Length Diagonals Bisect the Angles Diagonals are Perpendicular to Each Other always sometimes always sometimes always sometimes