The output is a point with coordinates in the given range or lying on the  given line or circle.

The command with(geometry,randpoint) allows the use of the abbreviated form of this command.

$\mathrm{with}\left(\mathrm{geometry}\right)\:$

$\mathrm{line}\left(l\,x-y=1\,\left[x\,y\right]\right),\mathrm{circle}\left(c\,x^2+y^2=1\,\left[x\,y\right]\right)\:$

$\mathrm{randpoint}\left(P\,-1..2\,-1..2\right)$

$P$

$\mathrm{coordinates}\left(P\right)$

$\left[0.314058468\,1.880696710\right]$

$\mathrm{randpoint}\left(Q\,l\,-2..3\right)$

$Q$

$\mathrm{coordinates}\left(Q\right)$

$\left[0.190097447\,\mathrm{-0.809902553}\right]$

$\mathrm{randpoint}\left(R\,c\right)$

$R$

$\mathrm{coordinates}\left(R\right)$