ACT 2016 December(74H) Math Question 3 Explanation - ACT Helper

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2016 December(74H) Math Question 3
Angles
- Collinear Points & Triangles
Choice C
$∠ B C D + ∠ B C A = 180 °$ $\Rightarrow ∠ B C A = 180 ° - 100 ° = 80 °$ $∠ C A B + ∠ A B C + ∠ B C A = 180 °$ $\Rightarrow 65 ° + X ° + 80 ° = 180 °$ $\Rightarrow X ° = 35 °$
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