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

Answer 1

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

Answer 2

ab and dc

Answer 3

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

Answer 4

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

Answer 5

AB||CD

Answer 6

and Ad||BC
are parallel

Answer 7

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

Answer 8

what theorem or postulate is it

Answer 9

Side Angle Side

Answer 10

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

Answer 11

because ABC is congruent to triangle CDA

Answer 12

do u know the definition of these 4 theorems?

Answer 13

no do u

Answer 14

define SAS postulate for me