Two angles are adjacent and their measures add up to
MATHEMATICS · Single correct · CBSE · Mathematics · Lines and Angles · Lines and Angles
Problem
Two angles are adjacent and their measures add up to 180∘. Which one of the following conclusions is necessarily true?
(a) Their non-common arms are perpendicular.
(b) Their non-common arms lie on the same straight line.
(c) Each of the angles measures 90∘.
(d) Their common arm is the angle bisector of a straight angle.