Question

7Prove that two lines perpendicular to the same line are parallel to each other.​

Answer 1

If two lines are perpendicular to the same line, prove that they are parallel to each other. Let the two lines m and n each be perpendicular to the same line I. In figure, ∠PQR = ∠PRQ, then prove that ∠PQS = ∠PRT. ... | If the sum of two adjacent angles is 180°, then the non-common arms of the angles form a line.