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.

Holt Mcdougal Larson Pre-algebra: Student Edition 2012
1st Edition
ISBN:9780547587776
Author:HOLT MCDOUGAL
Publisher:HOLT MCDOUGAL
Chapter12: Angle Relationships And Transformations
Section12.2: Angles And Parallel Lines
Problem 1E
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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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