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en.wikipedia.org/wiki/Equilateral_triangle

The area

mathworld.wolfram.com/EquilateralTriangle.html

An

www.mathwords.com/a/area_equilateral_triangle.htm

Area of an

formulas.tutorvista.com/math/equilateral-triangle-formula.html

An equilateral triangle has 3 sides whose length are equal. The equilateral
triangle has all the 3 internal angles equal to 60<sup>o</sup>.

keisan.casio.com/exec/system/1223266946

Calculates the area, perimeter and height of an

www.calculatorsoup.com/calculators/geometry-plane/triangles-equilateral.php

... altitude

www.khanacademy.org/math/geometry-home/geometry-area-perimeter/advanced-area-with-triangles/v/area-of-an-equilateral-triangle

www.vitutor.com/geometry/plane/equilateral_triangle.html

Equilateral triangle, definition, perimeter, area, height and apothem of an

rechneronline.de/pi/equilateral-triangle.php

Calculations of geometric shapes and solids:

www.khanacademy.org/math/geometry-home/congruence/working-with-triangles/v/equilateral-and-isosceles-example-problems

Three example problems involving isosceles and

More Info

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Geometry calculator for

www.mathportal.org

Enter side, perimeter, area or altitude of

www.mathopenref.com

A method of calculating the area of an