Aloha :)
$$\left.x^2+1,60^2=4,50^2\quad\right|\;-1,60^2$$$$\left.x^2=4,50^2-1,60^2\quad\right|\;\sqrt{\cdots}$$$$\left.x=\sqrt{4,50^2-1,60^2}\quad\right.$$$$\left.x\approx4,2059\,\mathrm m\quad\right.$$
~plot~ (4,2-(4,2/1,6)*x)*(x<=1,6) ; [[0|4,5|0|4,5]] ~plot~