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Introduction to Euclid Geometry — Maths STD 9 — Question

Gujarat BoardEnglish MediumSTD 9MathsIntroduction to Euclid Geometry1 Mark
MCQ
If a straight line falling on two straight lines makes the interior angles on the same side of it taken together less than $180^\circ$ then the two straight lines, if produced indefinitely, meet on that side on which the angles taken together are:
  • A
    $180^\circ$
  • ✓
    $< 180^\circ $
  • C
    $= 180^\circ$
  • D
    None of these
✓

Answer

Correct option: B.
$< 180^\circ $
According to Euclid's fifth postulate, if a straight line crossing two straight lines makes the interior angles on the same side less than two right angles, the two straight lines, if extended indefinitely, meet on that side on which are the angles less than the two right angles.

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