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Lines & Angles: Supplementary Angles

In the figure below, what is the value of $$x$$? ![](data:image/svg+xml;base64,<?xml version="1.0" encoding="utf-8"?>
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)
Incorrect. [[snippet]]
Incorrect. [[snippet]]
Incorrect. [[snippet]]
Incorrect. [[snippet]]
Correct. [[snippet]] Angles $$ADB$$ and $$ADC$$ are supplementary angles, so >$$\angle ADC = 180^\circ - 70^\circ = 110^\circ$$. Given that sum of all angles in a triangle is 180°, >$$110^\circ + 25^\circ + x = 180^\circ$$ >$$135^\circ + x = 180^\circ$$ >$$x = 180^\circ - 135^\circ$$ >$$x = 45^\circ$$
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