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The area of a triangle is \(60\,\text{cm}^2\). Its base is \(4\,\text{cm}\) longer than its height. What is the height of the triangle?

Answer and explanation

Correct answer: \(10\,\text{cm}\)

Let the height of the triangle be \(x\) cm. Then its base is \((x+4)\) cm. Using the area formula, \(\frac{1}{2}x(x+4)=60\), which gives \(x^2+4x-120=0\). Factoring, \((x-10)(x+12)=0\), so \(x=10\) or \(x=-12\). Since a length cannot be negative, the height is \(10\) cm. Exam tip: Always reject a negative root when the variable represents a physical length.

Related tags

Quadratic EquationsTriangle AreaWord ProblemsWord Problems And ApplicationsMathematicsClass 10 Mcq

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