Which of the following triangles are scalene triangles?

Answer

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Step by Step Solution

Step 1

For triangle I, it has three sides of unequal lengths. Hence, it is a scalene triangle.

Step 2

As for triangle II, it is not a scalene triangle. This is because two of its sides have the same length (9.3cm).

Step 3

As for triangle III, all of its internal angles are different. Therefore, it is a scalene triangle.

Step 4

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.

Step 5

Clearly, only triangle I and III are scalene triangles. Therefore, the answer is A.