which sides of a quadrilateral ABCD must be parallel?
m angle A=54, m angle b =43 m angle C=137 m angle D =126

Question

which sides of a quadrilateral ABCD must be parallel?
m angle A=54, m angle b =43 m angle C=137 m angle D =126

anonymous · Answer

im guessing DA AND CB BUT I AM NOT SURE BY WHICH THEOREM

anonymous · Answer

ab and dc

anonymous · Answer

CONVERSE OF THE ALTERNATE INTERIOR ANGLE THEOREM
CONVERSE OF THE COORESPONDING ANGLES THEOEM
CONVERSE OF THE  SAME SIDED INNTERIOR ANGLES THEOREM
CONVERSE OF THE ALTERNATE EXTERIOR ANGLES THEOREM

zale101 · Answer

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zale101 · Answer

A quadrilateral is a parallelogram if one pair of opposite sides are equal and parallel

zale101 · Answer

AB||CD

zale101 · Answer

and Ad||BC
are parallel

zale101 · Answer

the quadrilateral ABCD, AB||CD and AD||BC.
We conclude ABCD is a parallelogram.

anonymous · Answer

what theorem or postulate is it

zale101 · Answer

Side Angle Side

anonymous · Answer

converse of alternate interior angles theorem 
converse of the corresponding angles postulate
converse of th same side interior angles theorem
converse of the alternate exterior angels theorem

zale101 · Answer

because ABC is congruent to triangle CDA

zale101 · Answer

do u know the definition of these 4 theorems?

anonymous · Answer

no do u

zale101 · Answer

define SAS postulate for me