Conjecture: "In any triangle

MATHEMATICS · Single correct · CBSE · Mathematics · Triangles · Triangles

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 cm,  6 cm,  72 cm6\text{ cm},\;6\text{ cm},\;\sqrt{72}\text{ cm} (b) 7 cm,  7 cm,  10 cm7\text{ cm},\;7\text{ cm},\;10\text{ cm} (c) 7 cm,  7 cm,  14 cm7\text{ cm},\;7\text{ cm},\;14\text{ cm} (d) 5 cm,  12 cm,  13 cm5\text{ cm},\;12\text{ cm},\;13\text{ cm}

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