notes
equilateral triangle

Equilateral Triangle

An equilateral triangle is a triangle? in which all three sides have the same length.

An equivalent condition is that all three angles are the same.

Notes

  1. As the angles in a triangle? add up to 180 180^\circ, that all angles are the same means that they must each be 60 60^\circ.

  2. Equilateral triangles have three lines of symmetry? passing through the midpoint? of each side and the opposite angle.

  3. All equilateral triangles are similar?.

  4. A triangle with two angles of 60 60^\circ must be equilateral.

category: geometry