suppose ,that we are going to find are of $x*y=4$ bounded by $x=1$ and $x=4$ and $y=0$
generaly as i know are of function $y=f(x)$ bounded by $x=a$ and $x=b$ is given by
$A=\int(f(x)), x=a,x=b $; so in this case $y=4/x$ it's integral would be $4*ln(x)$,now if we put variables we will get $4*ln(4)-4*ln(1)$=$5.545-4*0=5.545$ but because this is bounded by $y=0$,is there any place where i should use this?for example in intersection or anything else?thanks guys