# 1.333 1.333 1.333 triangle

### Equilateral triangle.

Sides: a = 1.33333   b = 1.33333   c = 1.33333

Area: T = 0.77697618694
Perimeter: p = 43.9999
Semiperimeter: s = 21.99995

Angle ∠ A = α = 60° = 1.04771975512 rad
Angle ∠ B = β = 60° = 1.04771975512 rad
Angle ∠ C = γ = 60° = 1.04771975512 rad

Height: ha = 1.15546716709
Height: hb = 1.15546716709
Height: hc = 1.15546716709

Median: ma = 1.15546716709
Median: mb = 1.15546716709
Median: mc = 1.15546716709

Vertex coordinates: A[1.33333; 0] B[0; 0] C[0.667665; 1.15546716709]
Centroid: CG[0.667665; 0.3854890557]
Coordinates of the circumscribed circle: U[0.667665; 0.3854890557]
Coordinates of the inscribed circle: I[0.667665; 0.3854890557]

Exterior(or external, outer) angles of the triangle:
∠ A' = α' = 120° = 1.04771975512 rad
∠ B' = β' = 120° = 1.04771975512 rad
∠ C' = γ' = 120° = 1.04771975512 rad

# How did we calculate this triangle? ### 1. The triangle circumference is the sum of the lengths of its three sides ### 2. Semiperimeter of the triangle ### 3. The triangle area using Heron's formula ### 4. Calculate the heights of the triangle from its area. ### 5. Calculation of the inner angles of the triangle using a Law of Cosines    