Triangle calculator SSS - result

Please enter the triangle sides:

Obtuse isosceles triangle.

Sides: a = 16   b = 16   c = 25

Area: T = 124.8443652221
Perimeter: p = 57
Semiperimeter: s = 28.5

Angle ∠ A = α = 38.62548328731° = 38°37'29″ = 0.67441305067 rad
Angle ∠ B = β = 38.62548328731° = 38°37'29″ = 0.67441305067 rad
Angle ∠ C = γ = 102.7550334254° = 102°45'1″ = 1.79333316403 rad

Height: ha = 15.60554565277
Height: hb = 15.60554565277
Height: hc = 9.98774921777

Median: ma = 19.40436079119
Median: mb = 19.40436079119
Median: mc = 9.98774921777

Inradius: r = 4.38804790253
Circumradius: R = 12.81660300626

Vertex coordinates: A[25; 0] B[0; 0] C[12.5; 9.98774921777]
Centroid: CG[12.5; 3.32991640592]
Coordinates of the circumscribed circle: U[12.5; -2.82985378849]
Coordinates of the inscribed circle: I[12.5; 4.38804790253]

Exterior(or external, outer) angles of the triangle:
∠ A' = α' = 141.3755167127° = 141°22'31″ = 0.67441305067 rad
∠ B' = β' = 141.3755167127° = 141°22'31″ = 0.67441305067 rad
∠ C' = γ' = 77.25496657461° = 77°14'59″ = 1.79333316403 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     