A ladder of length 6.5 m leans against a vertical wall. If the top of the ladder is 3.6 m from the foot of the wall, calculator, correct to two decimal places, the distance from the wall to the foot of the ladder.
Show Solution
Let x = the distance from the wall to the foot of the ladder.

From Pythagorean theorem,

The hypothenuse (c) is the longest side. The side facing the right-angle (∟)
3.62 + x2 = 6.52
x2 = 6.52 - 3.62
Take square root of both sides.
x =
x = 5.41202365109 m ≈ 5.41 m (two decimal places)
∴ the distance from the wall to the foot of the ladder is 5.41 m