Geometry

Question Analysis:
This question examines the relationship between equilateral and isosceles triangles in terms of their definitions.

Key Concept Explanation:
An isosceles triangle has at least two equal sides, while an equilateral triangle has all three sides equal.
Since an equilateral triangle meets the criteria of having at least two equal sides, it can be considered a special case of an isosceles triangle.

Step - by - Step Solution:
By the definition of an equilateral triangle, all its sides are equal.
This means it has at least two equal sides, which is the defining feature of an isosceles triangle.

Common Mistakes:
Some might think that because an equilateral triangle has more specific properties, it cannot be classified as an isosceles triangle.
This overl...