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Lines and Angles — Maths STD 9 — Question

Gujarat BoardEnglish MediumSTD 9MathsLines and Angles1 Mark
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Answer

  1. 45º
    Solution:
    We have.
    $\theta+\phi=180^\circ$ [$\because$ AOD is a straight line]
    $\Rightarrow3\phi+\phi=180^\circ [\because\theta=3\phi]$
    $\Rightarrow4\theta=180^\circ$
    $\Rightarrow\phi=45^\circ.$

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