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Lines and Angles — Maths STD 9 — Question

Gujarat BoardEnglish MediumSTD 9MathsLines and Angles1 Mark
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Answer

  1. 10º
    Solution:
    2x - 20º + x + 100º = 110º (Exterior angle is equal to sum of its interior opposite angles)
    3x = 110º - 100º + 20º
    x = 10º.

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