a/c=cos60=1/2
2a=c
a+c=26,4
3a=26,4
a=26,4/3=8,8
8,8*2=17,6 см
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a/c=cos60=1/2
2a=c
a+c=26,4
3a=26,4
a=26,4/3=8,8
8,8*2=17,6 см