# Triangle calculator SSS - result

Please enter the triangle sides:

### Obtuse scalene triangle.

Sides: a = 16   b = 17   c = 25

Area: T = 134.5211373766
Perimeter: p = 58
Semiperimeter: s = 29

Angle ∠ A = α = 39.27548962352° = 39°16'30″ = 0.68554762527 rad
Angle ∠ B = β = 42.26985844296° = 42°16'7″ = 0.73877259685 rad
Angle ∠ C = γ = 98.45765193353° = 98°27'23″ = 1.71883904325 rad

Height: ha = 16.81551717208
Height: hb = 15.82660439725
Height: hc = 10.76217099013

Median: ma = 19.82442276016
Median: mb = 19.19898410624
Median: mc = 10.78219293264

Inradius: r = 4.63986680609
Circumradius: R = 12.63773969608

Vertex coordinates: A[25; 0] B[0; 0] C[11.84; 10.76217099013]
Centroid: CG[12.28; 3.58772366338]
Coordinates of the circumscribed circle: U[12.5; -1.85884407295]
Coordinates of the inscribed circle: I[12; 4.63986680609]

Exterior(or external, outer) angles of the triangle:
∠ A' = α' = 140.7255103765° = 140°43'30″ = 0.68554762527 rad
∠ B' = β' = 137.731141557° = 137°43'53″ = 0.73877259685 rad
∠ C' = γ' = 81.54334806647° = 81°32'37″ = 1.71883904325 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   