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Lines and Angles — Maths STD 9 — Question

Gujarat BoardEnglish MediumSTD 9MathsLines and Angles1 Mark
MCQ
An exterior angle of a triangle is 110º and its two interior opposite angles are equal. Each of these equal angles is:
  • A
    $70^\circ$
  • B
    $55^\circ$
  • C
    $35^\circ$
  • D
    $27\frac{1^\circ}{2}$
✓

Answer

  1. $55^\circ$
    Solution:
    Let each interior opposite angle be x.
    Then, x + x = 110° (Exterior angle property of a triangle)
    ⇒ 2x = 110°
    ⇒ x = 55°

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