Triangle calculator SSS - result

Please enter the triangle sides:

Obtuse scalene triangle.

Sides: a = 3   b = 26   c = 28

Area: T = 30.14402969461
Perimeter: p = 57
Semiperimeter: s = 28.5

Angle ∠ A = α = 4.75497013846° = 4°44'59″ = 0.08328979276 rad
Angle ∠ B = β = 45.85988345181° = 45°51'32″ = 0.88003876535 rad
Angle ∠ C = γ = 129.3911464097° = 129°23'29″ = 2.25883070725 rad

Height: ha = 20.09435312974
Height: hb = 2.31884843805
Height: hc = 2.15328783533

Median: ma = 26.97768419204
Median: mb = 15.0833103129
Median: mc = 12.10437184369

Inradius: r = 1.05875542788
Circumradius: R = 18.11552827053

Vertex coordinates: A[28; 0] B[0; 0] C[2.08992857143; 2.15328783533]
Centroid: CG[10.03297619048; 0.71876261178]
Coordinates of the circumscribed circle: U[14; -11.49662371014]
Coordinates of the inscribed circle: I[2.5; 1.05875542788]

Exterior(or external, outer) angles of the triangle:
∠ A' = α' = 175.2550298615° = 175°15'1″ = 0.08328979276 rad
∠ B' = β' = 134.1411165482° = 134°8'28″ = 0.88003876535 rad
∠ C' = γ' = 50.60985359027° = 50°36'31″ = 2.25883070725 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     