# 9 19 26 triangle

### Obtuse scalene triangle.

Sides: a = 9   b = 19   c = 26

Area: T = 62.35438290725
Perimeter: p = 54
Semiperimeter: s = 27

Angle ∠ A = α = 14.62222213888° = 14°37'20″ = 0.25552059072 rad
Angle ∠ B = β = 32.2044227504° = 32°12'15″ = 0.5622069803 rad
Angle ∠ C = γ = 133.1743551107° = 133°10'25″ = 2.32443169434 rad

Height: ha = 13.85664064606
Height: hb = 6.5643560955
Height: hc = 4.79664483902

Median: ma = 22.32215142855
Median: mb = 16.97879268463
Median: mc = 7.21111025509

Inradius: r = 2.30994010768
Circumradius: R = 17.82656895612

Vertex coordinates: A[26; 0] B[0; 0] C[7.61553846154; 4.79664483902]
Centroid: CG[11.20551282051; 1.59988161301]
Coordinates of the circumscribed circle: U[13; -12.19765244366]
Coordinates of the inscribed circle: I[8; 2.30994010768]

Exterior(or external, outer) angles of the triangle:
∠ A' = α' = 165.3787778611° = 165°22'40″ = 0.25552059072 rad
∠ B' = β' = 147.7965772496° = 147°47'45″ = 0.5622069803 rad
∠ C' = γ' = 46.82664488927° = 46°49'35″ = 2.32443169434 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.