Question

the foot of a ladder is 6m away from a wall and its top reaches a window 8m above the ground

Answer 1

10 cm will be the length of the ladder

Answer 2

foot of ladder= 6m(base)
top reaches a window 8m above the ground.(perpendicular)
height of the ladder? (hypotenuse)

so hypotenuse= $\sqrt{base^{2} + perpendicular^{2} }$

hyp= $\sqrt{ 6^{2} + 8^{2} }$

= $\sqrt{36+64}$
=$\sqrt{100}$ = 10

so 10m is the height of the ladder