ACT 2012 April(70G) Math Question 4 Explanation - ACT Helper

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2012 April(70G) Math Question 4
Angles
- Collinear Points & Triangles
Choice B
$∠ B C A = 180 ° - 81 ° = 99 °$ $∠ B A C = 180 ° - 150 ° = 30 °$ $∠ B = 180 ° - 99 ° - 30 ° = 51 °$
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