Triangle calculator

Please enter what you know about the triangle:
You have entered side a, b and c.

Obtuse scalene triangle.

Sides: a = 240   b = 127   c = 281

Area: T = 15183.76655409
Perimeter: p = 648
Semiperimeter: s = 324

Angle ∠ A = α = 58.31441645186° = 58°18'51″ = 1.01877741714 rad
Angle ∠ B = β = 26.76222663382° = 26°45'44″ = 0.46770896629 rad
Angle ∠ C = γ = 94.92435691432° = 94°55'25″ = 1.65767288193 rad

Height: ha = 126.5311379507
Height: hb = 239.1144417966
Height: hc = 108.0769505629

Median: ma = 182.0587683167
Median: mb = 253.4722385084
Median: mc = 130.8659657649

Inradius: r = 46.86334738916
Circumradius: R = 141.0220354551

Vertex coordinates: A[281; 0] B[0; 0] C[214.2921814947; 108.0769505629]
Centroid: CG[165.0977271649; 36.0233168543]
Coordinates of the circumscribed circle: U[140.5; -12.10333217686]
Coordinates of the inscribed circle: I[197; 46.86334738916]

Exterior(or external, outer) angles of the triangle:
∠ A' = α' = 121.6865835481° = 121°41'9″ = 1.01877741714 rad
∠ B' = β' = 153.2387733662° = 153°14'16″ = 0.46770896629 rad
∠ C' = γ' = 85.07664308568° = 85°4'35″ = 1.65767288193 rad

How did we calculate this triangle?

1. Input data entered: side a, b and c. 2. The triangle circumference is the sum of the lengths of its three sides 3. Semiperimeter of the triangle 4. The triangle area using Heron's formula 5. Calculate the heights of the triangle from its area. 6. Calculation of the inner angles of the triangle using a Law of Cosines     