• 2016 December(74H) Math Question 3

    Angles

    - Collinear Points & Triangles

    Choice C
    $$\angle BCD+\angle BCA = 180°$$ $$\Rightarrow\angle BCA=180°-100°=80°$$ $$\angle CAB+\angle ABC+\angle BCA=180°$$ $$\Rightarrow 65°+X°+80°=180°$$ $$\Rightarrow X°=35°$$

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