Triangle calculator SSS - result

Please enter the triangle sides:

Equilateral triangle.

Sides: a = 11.55   b = 11.55   c = 11.55

Area: T = 57.76549769642
Perimeter: p = 34.65
Semiperimeter: s = 17.325

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

Height: ha = 10.00325934137
Height: hb = 10.00325934137
Height: hc = 10.00325934137

Median: ma = 10.00325934137
Median: mb = 10.00325934137
Median: mc = 10.00325934137

Inradius: r = 3.33441978046
Circumradius: R = 6.66883956091

Vertex coordinates: A[11.55; 0] B[0; 0] C[5.775; 10.00325934137]
Centroid: CG[5.775; 3.33441978046]
Coordinates of the circumscribed circle: U[5.775; 3.33441978046]
Coordinates of the inscribed circle: I[5.775; 3.33441978046]

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     