Vinkelsummen i en trekant er altid 180 grader. Her vil vi bevise denne sætning ved at tegne en linje der er parallel med en af trekantens side og som går gennem det modstående hjørne. Dernæst vil vi ved at bruge transversaller, topinkler og tilsvarende vinkler arrangere trekantens vinkler, så de danner en lige vinkel og derfor må have en sum på 180 grader. Lavet af Sal Khan.
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