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The hypotenuse of a right-angled triangle is \(85\) cm. One leg is \(13\) cm longer than the other leg. What is the length of the smaller leg?

Answer and explanation

Correct answer: \(51\) cm

Let the smaller leg be \(x\) cm; then the other leg is \((x+13)\) cm. By the Pythagorean theorem, \(x^2+(x+13)^2=85^2\), which gives \(2x^2+26x-7056=0\). Its roots are \(x=51\) and \(x=-64\). Since a length cannot be negative, the smaller leg is \(51\) cm. Check: \(51^2+64^2=85^2\). Exam tip: In such problems, represent the smaller side by \(x\), express the larger side as \(x+\) the given difference, and then apply the Pythagorean theorem.

Related tags

Quadratic EquationsRight TrianglePythagorean TheoremWord ProblemsPolynomial RootsWord Problems And ApplicationsMathematicsClass 10 Mcq

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