Triangle calculator SSS - result

Please enter the triangle sides:

Equilateral triangle.

Sides: a = 3   b = 3   c = 3

Area: T = 3.8977114317
Perimeter: p = 9
Semiperimeter: s = 4.5

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

Height: ha = 2.59880762114
Height: hb = 2.59880762114
Height: hc = 2.59880762114

Median: ma = 2.59880762114
Median: mb = 2.59880762114
Median: mc = 2.59880762114

Inradius: r = 0.86660254038
Circumradius: R = 1.73220508076

Vertex coordinates: A[3; 0] B[0; 0] C[1.5; 2.59880762114]
Centroid: CG[1.5; 0.86660254038]
Coordinates of the circumscribed circle: U[1.5; 0.86660254038]
Coordinates of the inscribed circle: I[1.5; 0.86660254038]

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    