Triangle calculator SSS - result

Please enter the triangle sides:

Acute isosceles triangle.

Sides: a = 19   b = 26   c = 26

Area: T = 229.9221589895
Perimeter: p = 71
Semiperimeter: s = 35.5

Angle ∠ A = α = 42.86325090077° = 42°51'45″ = 0.74880919078 rad
Angle ∠ B = β = 68.56987454962° = 68°34'7″ = 1.19767503729 rad
Angle ∠ C = γ = 68.56987454962° = 68°34'7″ = 1.19767503729 rad

Height: ha = 24.20222726206
Height: hb = 17.68662761458
Height: hc = 17.68662761458

Median: ma = 24.20222726206
Median: mb = 18.69549190958
Median: mc = 18.69549190958

Inradius: r = 6.47766645041
Circumradius: R = 13.96656306372

Vertex coordinates: A[26; 0] B[0; 0] C[6.94223076923; 17.68662761458]
Centroid: CG[10.98107692308; 5.89554253819]
Coordinates of the circumscribed circle: U[13; 5.1032826579]
Coordinates of the inscribed circle: I[9.5; 6.47766645041]

Exterior(or external, outer) angles of the triangle:
∠ A' = α' = 137.1377490992° = 137°8'15″ = 0.74880919078 rad
∠ B' = β' = 111.4311254504° = 111°25'53″ = 1.19767503729 rad
∠ C' = γ' = 111.4311254504° = 111°25'53″ = 1.19767503729 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     