A 5-foot ladder is leaning against a 4-foot wall. How far must the bottom of the ladder be from the base of the wall so that the top of the ladder rests on the top of the wall?

A right angled triangle is formed here. By Pythagoras theorem, H² = B² + L² where L is the altitude (wall), B is the base (ground) and H is the hypotenuse (ladder). ⇒ 5² = B² + 4² ⇒ 25 = B² + 16 ⇒ B² = 25 - 16 = 9 ⇒ B = 3 The bottom of the ladder must be 3 feet away from the base of the wall.

Answered by brainybeauty | 2024-06-10

This is a classic example of a right angled triangle where the ladder is the hypotenuse and the wall and the base of the wall are the other 2 sides of the triangle. Since it is a right angled triangle, Pythagorean theorem will be applied to it.
So, we use the formula - hypotenuse^2 = side1^2 + side2^2
Here, h ypotenuse (ladder) = 5 feet, side1 (wall) = 4 feet, side2 (base of the wall) = unknown.
So, we have, 5^2 = 4 ^2 + side2^2 ==> side2^2 = 5^2 - 4^2 ==> side2^2 = 25 - 16 ==> side2^2 = 9 ==> side2 = square root (9) ==> side2 = 3
So, the final answer is --> the bottom of the ladder is 3 foot away from the base of the wall.

Answered by utsavsingh | 2024-06-24

The bottom of the 5-foot ladder must be 3 feet away from the base of the 4-foot wall for it to rest properly on the wall. This was calculated using the Pythagorean theorem. By solving the equation, we found that the distance is 3 feet.
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Answered by brainybeauty | 2024-09-30