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tg30=b/a
√3/3=12/a
36=a√3
a=36/√3=12√3 ----->dl,drugiej przyprostokatnej
sin30=b/c
1/2=12/c
c=2·12=24cm
Obwod Δ O=a+b+c=12√3+12+24=12√3+36=12(√3+3)cm