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A ladder is \(10\text{ m}\) long, and its foot is \(6\text{ m}\) from a wall. If the foot is moved \(2\text{ m}\) farther away from the wall, how high will the ladder reach on the wall?

Answer and explanation

Correct answer: \(6\text{ m}\)

After moving the foot \(2\text{ m}\) farther, the new horizontal distance from the wall is \(6+2=8\text{ m}\). The ladder, wall and ground form a right-angled triangle. By the Pythagorean theorem, \(h^2+8^2=10^2\), so \(h^2=36\) and \(h=6\text{ m}\), since height is positive. The option \(8\text{ m}\) is the new horizontal distance, not the height. Exam tip: Treat the ladder as the hypotenuse and recalculate the perpendicular height after updating the horizontal distance.

Related tags

Quadratic EquationsWord ProblemsPythagorean TheoremRight TrianglesLadder ProblemsWord Problems And ApplicationsMathematicsClass 10 Mcq

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