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What is an equilateral triangle in geometry – its definition, properties, picture, and types along with formulas for area and perimeter Learn how to calculate the area, perimeter, semi-perimeter, and altitude of an equilateral triangle using simple formulas. See solved examples and FAQs on equilateral triangles. An equilateral triangle, also known as a triangle with equal sides , is a fundamental shape in geometry. Each of its sides is of equal length, and its interior angles are all 60 degrees, making it a 60-degree triangle. It is also a perfectly symmetrical shape. Learn what an equilateral triangle is, how to identify it, and how to calculate its area and perimeter. Find formulas, examples, worksheets, and videos on equilateral triangle geometry.
