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(x^2 to jest kwadrat x, czyli x*x)
x = dłuższy bok prostokąta
3/4x = krótszy bok prostokąta
y= przekątna prostokąta
2x+2(3/4x)=28
x^2+(3/4x)^2=y^2
2x+6/4x=28
x^2+(3/4x)^2=y^2
2x+1,5x=28
x^2+(3/4x)^2=y^2
3,5x=28
x^2+(3/4x)^2=y^2
x=8
64+36=y^2
x=8
y=10