Worked example: Triangle angles (intersecting lines)
4:55
Khan AcademySal Khan
Worked example: Triangle angles (intersecting lines)
Learn how to find unknown angles in triangles and intersecting lines. We use concepts like supplementary angles (angles that add up to 180°), vertical angles (opposite angles made by two crossing lines), and exterior angles (angles outside a triangle). There are lots of ways to think about this problem.
Sep 23, 2011
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