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α=45 β=40
ROZWIĄZANIE
a=b+h+h*ctg40
a=b+h(1+ctg40)
a-b=h(1+ctg40)
h=(a-b)/(1+ctg40)
P=1/2*(a+b)*(a-b)/(1+ctg40)=1/2*(a²-b²)/(1+ctg40)
P=1/2*(100-16)/(1+1,1917)=19,16