Which of the following must be true?(I) If two lines form congruent adjacent angles, then the lines are perpendicular.(II) If two lines are perpendicular, then they form congruent adjacentangles.(III) If the exterior sides of two adjacent obtuse angles are perpendicular,then the angles are complementary.

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
Problem 1CT
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Which of the following must be true?
(I) If two lines form congruent adjacent angles, then the lines are perpendicular.
(II) If two lines are perpendicular, then they form congruent adjacent
angles.
(III) If the exterior sides of two adjacent obtuse angles are perpendicular,
then the angles are complementary.

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