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p - przekątna
alfa=45 stopni
a=3
^ - oznacza do kwadratu
sqrt - oznacza pierwiastek z danej liczby
c^=a^+a^
c^=2a^
c^=2*9=18
c=sqrt18=3sqrt2
cos(alfa)=c/p
sqrt2/2=3sqrt2/p
p*sqrt2=6sqrt2
p=6
p^=c^+h^
36=9*2+h^
h^=18
h=sqrt18=3sqrt2