# Triangle calculator SSS - result

Please enter the triangle sides:

### Obtuse scalene triangle.

Sides: a = 17   b = 19   c = 26

Area: T = 161.3699142032
Perimeter: p = 62
Semiperimeter: s = 31

Angle ∠ A = α = 40.79221107438° = 40°47'32″ = 0.71219566413 rad
Angle ∠ B = β = 46.90112441381° = 46°54'4″ = 0.81985811335 rad
Angle ∠ C = γ = 92.30766451181° = 92°18'24″ = 1.61110548788 rad

Height: ha = 18.98546049449
Height: hb = 16.9866225477
Height: hc = 12.41330109255

Median: ma = 21.12546301743
Median: mb = 19.80553023203
Median: mc = 12.49899959968

Inradius: r = 5.20554561946
Circumradius: R = 13.01105420006

Vertex coordinates: A[26; 0] B[0; 0] C[11.61553846154; 12.41330109255]
Centroid: CG[12.53884615385; 4.13876703085]
Coordinates of the circumscribed circle: U[13; -0.52436441053]
Coordinates of the inscribed circle: I[12; 5.20554561946]

Exterior(or external, outer) angles of the triangle:
∠ A' = α' = 139.2087889256° = 139°12'28″ = 0.71219566413 rad
∠ B' = β' = 133.0998755862° = 133°5'56″ = 0.81985811335 rad
∠ C' = γ' = 87.69333548819° = 87°41'36″ = 1.61110548788 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    