Triangle calculator SSS - result

Please enter the triangle sides:

Obtuse scalene triangle.

Sides: a = 11   b = 21   c = 25

Area: T = 114.4211097268
Perimeter: p = 57
Semiperimeter: s = 28.5

Angle ∠ A = α = 25.84219327632° = 25°50'31″ = 0.45110268118 rad
Angle ∠ B = β = 56.32105874737° = 56°19'14″ = 0.98329796881 rad
Angle ∠ C = γ = 97.83774797631° = 97°50'15″ = 1.70875861537 rad

Height: ha = 20.80438358669
Height: hb = 10.89772473589
Height: hc = 9.15436877814

Median: ma = 22.42220873248
Median: mb = 16.21095650774
Median: mc = 11.16991539518

Inradius: r = 4.01547753427
Circumradius: R = 12.61878653629

Vertex coordinates: A[25; 0] B[0; 0] C[6.1; 9.15436877814]
Centroid: CG[10.36766666667; 3.05112292605]
Coordinates of the circumscribed circle: U[12.5; -1.7210618004]
Coordinates of the inscribed circle: I[7.5; 4.01547753427]

Exterior(or external, outer) angles of the triangle:
∠ A' = α' = 154.1588067237° = 154°9'29″ = 0.45110268118 rad
∠ B' = β' = 123.6799412526° = 123°40'46″ = 0.98329796881 rad
∠ C' = γ' = 82.16325202369° = 82°9'45″ = 1.70875861537 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     