# Triangle calculator SSS - result

Please enter the triangle sides:

### Equilateral triangle.

Sides: a = 7.1   b = 7.1   c = 7.1

Area: T = 21.82881703024
Perimeter: p = 21.3
Semiperimeter: s = 10.65

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

Height: ha = 6.14987803669
Height: hb = 6.14987803669
Height: hc = 6.14987803669

Median: ma = 6.14987803669
Median: mb = 6.14987803669
Median: mc = 6.14987803669

Inradius: r = 2.05495934556
Circumradius: R = 4.09991869112

Vertex coordinates: A[7.1; 0] B[0; 0] C[3.55; 6.14987803669]
Centroid: CG[3.55; 2.05495934556]
Coordinates of the circumscribed circle: U[3.55; 2.05495934556]
Coordinates of the inscribed circle: I[3.55; 2.05495934556]

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    