What is an equilateral triangle? Learn the definition and properties of equilateral triangles, as well as the angles and measurements of equilateral triangles.

What are equilateral polygons and equiangular polygons? Learn the equilateral polygon definition and the equiangular polygon definition with examples.

Learn how to classify scalene, isosceles, and equilateral triangles by side lengths, and see examples that walk through sample problems step-by-step for you to improve your math knowledge and skills.

Learn to calculate the area of an equilateral triangle. Understand the derivation of the formula for calculating the area and learn to prove it yourself.

If an equilateral triangle is inscribed in a circle with the area of 26 in 2, shown in the figure below, determine the height of the equilateral triangle.

Discover how to calculate the area of an equilateral triangle in this 5-minute video. Understand the formula through examples and test your skills with a quiz.

Equilateral triangles also make things faster because with all three sides being the same length, finding the perimeter, or the distance around the outside of the triangle, is a breeze!

Discover the classifications of triangles and learn how to classify triangles by sides and angles. Explore the properties of scalene, isosceles, equilateral, acute, obtuse, and right triangles.

Learn how to inscribe an equilateral triangle in a circle, and see examples that walk through sample problems step-by-step for you to improve your math knowledge and skills.

Learn how to identify scalene, isosceles, and equilateral triangles from coordinates, and see examples that walk through sample problems step-by-step for you to improve your math knowledge and skills.