drabine-o-dlugosci-4-metrow-oparto-o-pionowy-mur-a

$0^\circ <\alpha<30^\circ$0^\circ <\alpha<30^\circ

$30^\circ <\alpha<45^\circ$30^\circ <\alpha<45^\circ

$45^\circ <\alpha<60^\circ$45^\circ <\alpha<60^\circ

$60^\circ <\alpha<90^\circ$60^\circ <\alpha<90^\circ