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Worked example Triangle angles intersecting lines video Khan Academy If you’re seeing this message it means we’re having trouble loading external resources on our website behind a web filter please make sure that the domains kastatic org and kasandbox are unblocked To log in use all features of enable JavaScript your browser Courses Search DonateLoginSign upSearch for courses skills videos Main contentMath th grade Geometry Angles triangle sum to proof Practice Find triangles Isosceles amp equilateral problems isosceles exterior angle This is currently selected item diagram Finding measures using challenge problem reviewNext lessonPythagorean theoremCurrent time Total duration energy pointsMath CCSS Math G A Google Classroom Facebook Twitter EmailTriangle theoremVideo transcriptWe x re given bunch here intersect different ways form And what I want do we ve been some figure out measure going call so encourage you pause right now try yourself then m give solution So assuming unpaused solved or at least good shot let s fun about these there multiple solve kind just have keep figuring can say start left-hand side over degrees d well look supplementary plus green has be equal minus Let see same thing as would me write down That Now two third because they need add up Or could here– ll question mark– know mark needs if subtract from both sides get already You another Well vertical with also getting pretty close We zoom save space actually don t even much math one The other will any essentially exact degree case added us by taking subtracting done reasoned through immediately said– Maybe faster way but wouldn able basic steps said an It remote interior ended doing when did step-by-step before But few things ahead maybe skip step Although like anything weird anyway which knew ton thought Up NextWorked Our mission provide free world-class education anyone anywhere c nonprofit organization Donate volunteer today Site NavigationAboutNewsImpactOur teamOur internsOur content specialistsOur leadershipOur supportersOur contributorsOur financesCareersInternshipsContactHelp centerSupport communityShare storyPressDownload appsiOS appAndroid appCoursesMath Pre-K – gradeMath Get ready coursesMath high school collegeTest prepScienceComputingArts humanitiesEconomicsReading language artsLife skillsLanguage EnglishAz rbaycancaBahasa Indonesia e tinadanskDeutschEnglishespa olfran aisitalianomagyarNederlandsnorsk bokm lO zbekpolskiportugu sportugu Portugal rom n svenskaT rk Country U S IndiaMexicoBrazil Terms Privacy Policy