Triangle calculator

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

Obtuse scalene triangle.

Sides: a = 2.7   b = 1.8   c = 3.6

Area: T = 2.35328373828
Perimeter: p = 8.1
Semiperimeter: s = 4.05

Angle ∠ A = α = 46.56774634422° = 46°34'3″ = 0.81327555614 rad
Angle ∠ B = β = 28.95550243719° = 28°57'18″ = 0.50553605103 rad
Angle ∠ C = γ = 104.4787512186° = 104°28'39″ = 1.82334765819 rad

Height: ha = 1.74328425058
Height: hb = 2.61442637587
Height: hc = 1.30771318793

Median: ma = 2.50554939633
Median: mb = 3.05220484924
Median: mc = 1.42330249471

Inradius: r = 0.58109475019
Circumradius: R = 1.85990320062

Vertex coordinates: A[3.6; 0] B[0; 0] C[2.36325; 1.30771318793]
Centroid: CG[1.98875; 0.43657106264]
Coordinates of the circumscribed circle: U[1.8; -0.46547580015]
Coordinates of the inscribed circle: I[2.25; 0.58109475019]

Exterior(or external, outer) angles of the triangle:
∠ A' = α' = 133.4332536558° = 133°25'57″ = 0.81327555614 rad
∠ B' = β' = 151.0454975628° = 151°2'42″ = 0.50553605103 rad
∠ C' = γ' = 75.52224878141° = 75°31'21″ = 1.82334765819 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     