angie012706
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HELP ASAP!!!
The figure below shows a quadrilateral ABCD. Sides AB and DC are congruent and parallel:

A quadrilateral ABCD is shown with the opposite sides AB and DC shown parallel and equal.

A student wrote the following sentences to prove that quadrilateral ABCD is a parallelogram:

Side AB is parallel to side DC, so the alternate interior angles, angle ABD and angle CDB, are congruent. Side AB is equal to side DC, and DB is the side common to triangles ABD and CDB. Therefore, the triangles ABD and CDB are congruent by ________. By CPCTC, angles DBC and ADB are congruent and sides AD and BC are congruent. Angle DBC and angle ADB form a pair of alternate interior angles. Therefore, AD is congruent and parallel to BC. Quadrilateral ABCD is a parallelogram because its opposite sides are equal and parallel.

Which phrase best completes the student's proof?

AAS Postulate
HL Postulate
SAS Postulate
SSS Postulate

Respuesta :

DynamoPrince2612

Answer:

SAS Criterian of Congruency.

Step-by-step explanation:

Since, the Side AB and DC are parallel, angle ABD and CBD are alternate and one side DB is common hence, Side - Angle - Side Postulate.

bringmethehorizon011

Answer:

My guess is B. They are congruent by the ASA postulate.

Step-by-step explanation:

Angle-Side-Angle (ASA) Postulate-

If two angles and the included side of one triangle are congruent to two angles and the included side of another triangle, the triangles are congruent.

(Hope this helps, I'm not sure if this is right)

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