6.6 Trapezoids Flashcards
BASES or a trapezoid
parallel sides
trapezoid
quadrilateral with EXACTLY one pair of parallel sides
LEGS of a trapezoid
NONparallel sides
base ANGLES of a trapezoid
pair of angles that SHARE a common base
isosceles trapezoid
trapezoid with congruent LEGS(nonparallel sides)
can the bases be congruent in an isosceles trapezoid?
NO because then it would be a parallelogram
can a trapezoid be equiangular?
no because then it would be a parallelogram
TRAPEZOID base angles thm
if a TRAPEZOID is isosceles, then each pair of base angles is congruent
TRAPEZOID diagonals thm
if a TRAPEZOID is isosceles, then it’s diagonals are congruent
if a TRAPEZOID has one pair of congruent base angles, then…
it is an isosceles trapezoid
if a TRAPEZOID has congruent diagonals, then…
it is an isosceles trapezoid
what do you HAVE to know before using the isosceles trapezoid thms??
YOU HAVE TO KNOW IT IS A TRAPEZOID BEFORE YOU USE THE THM
