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u = 2 • ( l + l1 )
u = 2 • ( 6 cm + 7,2111 cm )
26,4222 cm = 2 • ( 13,2111 cm )
u = 2 • ( l + √ l2 + b2 )
Umfang
u = 2 • ( 6 cm + √ 36 cm² + 16 cm2 )
u = 2 • ( 6 cm + 7,2111 cm )
26,4222 = 2 • ( 13,2111 cm )