# 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 $180^\circ$, that all angles are the same means that they must each be $60^\circ$.

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 $60^\circ$ must be equilateral.

category: geometry