Question

we can construct an equilateral triangle is uniquely if we know its ___.​

Answer 1

Answer:

In geometry, an equilateral triangle is a triangle in which all three sides have the same length. In the familiar Euclidean geometry, an equilateral triangle is also equiangular; that is, all three internal angles are also congruent to each other and are each 60°. It is also a regular polygon, so it is also referred to as a regular triangle.

Equilateral triangle

Triangle.Equilateral.svg

Type

Regular polygon

Edges and vertices

3

Schläfli symbol

{3}

Coxeter diagram

CDel node 1.pngCDel 3.pngCDel node.png

Symmetry group

D3

Area

{\displaystyle {\tfrac {\sqrt {3}}{4}}a^{2}}\tfrac{\sqrt{3}}{4} a^2

Internal angle (degrees)

60°