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P=AC*h/2
180o-2*75o=30o
sin30o=h/AC
h=5
P=25cm²
zad11
a=13
d1=10
13²-5²=(d2/2)²
d2=24
zad12
P=100√3
P=a²√3/4
400√3=a²√3
a=√400
a=20