Parallelogram  ABCD with diagonals  AC and  BD is displayed.   See Attachment, please.   It is given that  AC = BD. After proving that △BAD≅△ABC  and △ADC≅△BCD, a teacher asks the students to prove that the parallelogram is a rectangle. Part of the proof is displayed, but two of the reasons are missing. See Attachment, please.

Elementary Geometry For College Students, 7e
7th Edition
ISBN:9781337614085
Author:Alexander, Daniel C.; Koeberlein, Geralyn M.
Publisher:Alexander, Daniel C.; Koeberlein, Geralyn M.
ChapterP: Preliminary Concepts
SectionP.CT: Test
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Parallelogram  ABCD with diagonals  AC and  BD is displayed.

 

See Attachment, please.

 

It is given that  AC = BD. After proving that △BAD≅△ABC  and △ADC≅△BCD, a teacher asks the students to prove that the parallelogram is a rectangle. Part of the proof is displayed, but two of the reasons are missing.

See Attachment, please.

Parallelogram ABCD with diagonals AC and BD is displayed.
D.
A
B
It is given that AC = BD. After proving that ABAD=AABC and AADC = ABCD, a teacher asks the students to prove that the parallelogram is a rectangle. Part of the proof is displayed, but two of the reasons are missing.
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Transcribed Image Text:Parallelogram ABCD with diagonals AC and BD is displayed. D. A B It is given that AC = BD. After proving that ABAD=AABC and AADC = ABCD, a teacher asks the students to prove that the parallelogram is a rectangle. Part of the proof is displayed, but two of the reasons are missing. --
Statement
Reason
ZBAD = ZABC, ZADC = ZBCD
ZBAD and ZABC are supplementary
Y
|ZADC and BCD are supplementary
m/BAD+mZABC = 180°
MZADC + MZBCD= 180°
The sum of the measures of supplementary angles is 180°.
MZBAD= MZABC
MZADC = m/BCD
m/BAD+m/BAD= 180
MLADC+MZADC = 180°
2m/BAD= 180°
2MLADC = 180°
m/BAD= 90°
MZADC =90°
ZBAD, ZABC, ZADC, and ZBCD are right angles Right angles have a measure of 90°
Congruent angles are angles of equal measure.
Substitution
Property of addition
Division property of equality
What are the missing reasons X and Y?
X: Corresponding parts of congruent triangles are congruent.
Y: If two parallel lines are cut by a transversal, the interior angles on the same side of the transversal are supplementary.
X: Corresponding parts of congruent triangles are congruent.
Y: If two parallel lines are cut by a transversal, the exterior angles on the same side of the transversal are supplementary.
X: Consecutive angles of a parallelogram are congruent.
Y: If two parallel lines are cut by a transversal, the interior angles on the same side of the transversal are supplementary.
X: Consecutive angles of a parallelogram are congruent.
Y: If two parallel lines are cut by a transversal, the exterior angles on the same side of the transversal are supplementary.
Transcribed Image Text:Statement Reason ZBAD = ZABC, ZADC = ZBCD ZBAD and ZABC are supplementary Y |ZADC and BCD are supplementary m/BAD+mZABC = 180° MZADC + MZBCD= 180° The sum of the measures of supplementary angles is 180°. MZBAD= MZABC MZADC = m/BCD m/BAD+m/BAD= 180 MLADC+MZADC = 180° 2m/BAD= 180° 2MLADC = 180° m/BAD= 90° MZADC =90° ZBAD, ZABC, ZADC, and ZBCD are right angles Right angles have a measure of 90° Congruent angles are angles of equal measure. Substitution Property of addition Division property of equality What are the missing reasons X and Y? X: Corresponding parts of congruent triangles are congruent. Y: If two parallel lines are cut by a transversal, the interior angles on the same side of the transversal are supplementary. X: Corresponding parts of congruent triangles are congruent. Y: If two parallel lines are cut by a transversal, the exterior angles on the same side of the transversal are supplementary. X: Consecutive angles of a parallelogram are congruent. Y: If two parallel lines are cut by a transversal, the interior angles on the same side of the transversal are supplementary. X: Consecutive angles of a parallelogram are congruent. Y: If two parallel lines are cut by a transversal, the exterior angles on the same side of the transversal are supplementary.
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