# 14 21 26 triangle

### Obtuse scalene triangle.

Sides: a = 14   b = 21   c = 26

Area: T = 146.6766301767
Perimeter: p = 61
Semiperimeter: s = 30.5

Angle ∠ A = α = 32.4988384677° = 32°29'54″ = 0.56772038142 rad
Angle ∠ B = β = 53.69985931844° = 53°41'55″ = 0.93772172548 rad
Angle ∠ C = γ = 93.80330221386° = 93°48'11″ = 1.63771715846 rad

Height: ha = 20.95437573953
Height: hb = 13.96991715968
Height: hc = 11.28327924436

Median: ma = 22.57221066806
Median: mb = 18.04985456478
Median: mc = 12.22770192606

Inradius: r = 4.80990590743
Circumradius: R = 13.02986895496

Vertex coordinates: A[26; 0] B[0; 0] C[8.28884615385; 11.28327924436]
Centroid: CG[11.42994871795; 3.76109308145]
Coordinates of the circumscribed circle: U[13; -0.86441477762]
Coordinates of the inscribed circle: I[9.5; 4.80990590743]

Exterior(or external, outer) angles of the triangle:
∠ A' = α' = 147.5021615323° = 147°30'6″ = 0.56772038142 rad
∠ B' = β' = 126.3011406816° = 126°18'5″ = 0.93772172548 rad
∠ C' = γ' = 86.19769778614° = 86°11'49″ = 1.63771715846 rad

# How did we calculate this triangle?

Now we know the lengths of all three sides of the triangle and the triangle is uniquely determined. Next we calculate another its characteristics - same procedure as calculation of the triangle from the known three sides SSS. ### 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 ### 6. Inradius ### 7. Circumradius ### 8. Calculation of medians #### Look also our friend's collection of math examples and problems:

See more informations about triangles or more information about solving triangles.