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P=1/2 * d^2, gdzie d to przekatna
40=1/2*d^2 /*2
80=d^2 /wyciagamy pierwiastek
d = 4√5
a=√40=√(4*10)=2√10
p=a√2=2*√10*√2=2*√20=2*√(4*5)=4*√5cm