6.5 Special Parallelograms Flashcards
rectangle
a parallelogram that has four right angles
rhombus
a parallelogram that has four congruent sides
square
AKA: ?
a parallelogram that is both a rhombus and a rectangle
AKA: a parallelogram that has four congruent sides and four right angles
a parallelogram is a RHOMBUS if and only if its’s diagonals are..
perpendicular
a parallelogram is a RHOMBUS if and only if each diagonal…
bisects a pair of opposite angles
a parallelogram is a RECTANGLE if and only if it’s diagonals are…
congruent
a quadrilateral is a RHOMBUS if and only if it has…
four congruent sides
a quadrilateral is a RECTANGLE if and only if it has…
four right angles
what does IF AND ONLY IF mean? and what is the symbol?
it means the converse must also be true
the symbol is a double sided arrow