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2 bok - 4² + 6² = c ² 16+36=c ² 52=c ² c= √52= 2√13
3 bok - 4² + 2² = a ² 16+4=a ² a²=20 a=2√5
L= 8+2√13+2√5=2(4+√13+√5)cm