Equilateral triangle.

Sides: a = 60   b = 60   c = 60

Area: T = 1558.846572681
Perimeter: p = 180
Semiperimeter: s = 90

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

Height: h_a = 51.96215242271
Height: h_b = 51.96215242271
Height: h_c = 51.96215242271

Median: m_a = 51.96215242271
Median: m_b = 51.96215242271
Median: m_c = 51.96215242271

Inradius: r = 17.32105080757
Circumradius: R = 34.64110161514

Vertex coordinates: A[60; 0] B[0; 0] C[30; 51.96215242271]
Centroid: CG[30; 17.32105080757]
Coordinates of the circumscribed circle: U[30; 17.32105080757]
Coordinates of the inscribed circle: I[30; 17.32105080757]

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

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