# Triangle calculator SSS - result

Please enter the triangle sides:

### Obtuse scalene triangle.

Sides: a = 4   b = 23   c = 26

Area: T = 32.3022283201
Perimeter: p = 53
Semiperimeter: s = 26.5

Angle ∠ A = α = 6.20220192449° = 6°12'7″ = 0.10882456561 rad
Angle ∠ B = β = 38.40436536582° = 38°24'13″ = 0.67702702011 rad
Angle ∠ C = γ = 135.3944327097° = 135°23'40″ = 2.36330767964 rad

Height: ha = 16.15111416005
Height: hb = 2.80988941914
Height: hc = 2.48547910155

Median: ma = 24.46442596455
Median: mb = 14.62201915172
Median: mc = 10.17334949747

Inradius: r = 1.21989540831
Circumradius: R = 18.51326232805

Vertex coordinates: A[26; 0] B[0; 0] C[3.13546153846; 2.48547910155]
Centroid: CG[9.71215384615; 0.82882636718]
Coordinates of the circumscribed circle: U[13; -13.1880182879]
Coordinates of the inscribed circle: I[3.5; 1.21989540831]

Exterior(or external, outer) angles of the triangle:
∠ A' = α' = 173.7987980755° = 173°47'53″ = 0.10882456561 rad
∠ B' = β' = 141.5966346342° = 141°35'47″ = 0.67702702011 rad
∠ C' = γ' = 44.60656729031° = 44°36'20″ = 2.36330767964 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    