Answer :
Length of ladder = 12 foot
[tex]\text{Distance from the base of wall to the base of ladder = }(\sqrt{2})^6 [/tex]
Now, since, the height of the wall and the ground's surface are perpendicular to each other.
Thus the triangle thus formed will be a right angled triangle.
Where Hypotenuse = 12 foot
[tex]\text{Length of base = }(\sqrt{2})^6=8\:\:foot[/tex]
By applying Pythagoras theorem ,
[tex]\text{height of the wall = }\sqrt{144 - 64}=\sqrt{80}\:\:foot[/tex]
