Q. 175.0( 4 Votes )

# If two straight lines are perpendicular to the same line, prove that they are parallel to each other.

ABPQ,

Therefore, ABD = 90° _____________ (i)

CDPQ,

Therefore, CDQ = 90° _____________ (ii)

From equations (i0 and (ii)

ABD = CDQ = 90°

Hence, AB||CD because Cross ponding angles are equal.

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