You have entered side a, b and c (as equilateral triangle).
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: ha = 51.96215242271 Height: hb = 51.96215242271 Height: hc = 51.96215242271
Median: ma = 51.96215242271 Median: mb = 51.96215242271 Median: mc = 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