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vinkel sum i trekant er altid 180 grader
man laver en indskreven cirkel i en trekant ved at lave en streg hvor vinkelhalveringslinjerne skære hinanden
omskreven ovenover men istedet for vinkelhalveringslinjerne så midtnormal
medianen deler en sider midtpå
top og nabo top har altid 180 grader med vinkel vedsidenaf
nabo har altid 180 grader
der er en retvinklet trekant en ligebenet trekant og en ligesidet trekant
der er et rektangel et parallelogram et kvadrat en rombe og en trapez