Which of the following triangles are equilateral triangles?
For triangle I, it has three sides of equal length (5ft). Hence, it is an equilateral triangle.
As for triangle II, it is not an equilateral triangle. This is because each of its internal angle is not 60°.
As for triangle III, not all the sides have the same length. Therefore, it is not an equilateral 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 an equilateral triangle.
Clearly, only triangle I and IV are equilateral triangles. Therefore, the answer is B.
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