Which of the following triangles are scalene triangles?
For triangle I, it has three sides of unequal lengths. Hence, it is a scalene triangle.
As for triangle II, it is not a scalene triangle. This is because two of its sides have the same length (9.3cm).
As for triangle III, all of its internal angles are different. Therefore, it is a scalene triangle.
For triangle IV, its internal angles are 60° each. This means that all the sides of the triangle have the same length. Hence, this is not a scalene triangle.
Clearly, only triangle I and III are scalene triangles. Therefore, the answer is A.
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