cowerdwhisper23
14.12.2020 •
Mathematics
(02 06 MC)
The figure below shows a parallelogram ABCD. Side AB is parallel to side DC, and side AD is parallel to side BC:
c
A student wrote the following sentences to prove that parallelogram ABCD has two pairs of opposite sides equal
For triangles ABD and CDB, alternate interior angle ABD is congruent to angle CDB because AB and DC are parallel lines. Similarly, alternate interior
ADB is equal to angle CBD because AD and BC are parallel lines. DB is equal to DB by the reflexive property. Therefore, triangles ABD and CDB are
congruent by the SAS postulate. Therefore, AB is congruent to DC and AD is congruent to BC by CPCTC.
Which statement best describes a flaw in the student's proof?
O Angle ABD is congruent to angle CBD because they are vertical angles, not alternate interior angles.
O Angle ABD is congruent to angle CBD because they are corresponding angles, not alternate interior angles
Triangles ABD and CDB are congruent by the SSS postulate instead of the SAS postulate
Triangles ABD and CDB are congruent by the ASA postulate instead of the SAS postulate
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