tan 45 = length of wall/distance between ladder and wall
1 = length of wall/15
length of wall = 15m
(length of wall[tex])^{2}[/tex] + (distance between ladder and wall[tex])^{2}[/tex] = (length of ladder[tex])^{2}[/tex]
length of ladder = [tex]\sqrt{15^{2} + 15^{2} }[/tex]
= [tex]\sqrt{450}[/tex]
= 21.21 m
