Mathematics

Problem

Conjecture: "In any triangle, if two sides are equal, then the triangle is right-angled." Which of the following sets of side lengths is a counterexample to this conjecture? a)

6\text{ cm},\;6\text{ cm},\;\sqrt{72}\text{ cm}

7\text{ cm},\;7\text{ cm},\;10\text{ cm}

7\text{ cm},\;7\text{ cm},\;14\text{ cm}

5\text{ cm},\;12\text{ cm},\;13\text{ cm}

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