# Triangle calculator SSS - result

Please enter the triangle sides:

### Equilateral triangle.

Sides: a = 17.32   b = 17.32   c = 17.32

Area: T = 129.8966189544
Perimeter: p = 51.96
Semiperimeter: s = 25.98

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

Height: ha = 154.9995599935
Height: hb = 154.9995599935
Height: hc = 154.9995599935

Median: ma = 154.9995599935
Median: mb = 154.9995599935
Median: mc = 154.9995599935

Inradius: r = 54.9998533312
Circumradius: R = 10.9997066624

Vertex coordinates: A[17.32; 0] B[0; 0] C[8.66; 154.9995599935]
Centroid: CG[8.66; 54.9998533312]
Coordinates of the circumscribed circle: U[8.66; 54.9998533312]
Coordinates of the inscribed circle: I[8.66; 54.9998533312]

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    